When your personal data is used against you
Companies can now quickly estimate what you are willing to pay and adjust prices based on what they know about you. The more they know, the closer they can get to the maximum price you are willing to pay for any given purchase.
In 2025, the FTC reported (opens in a new tab) that companies are building real-time prices based on a person's exact location, browsing history, or even mouse movements, charging different prices for the same goods and services based on your personal data.
The same personal information that you agree to share when you download an app or visit a website can also be used in ways you may not like. With AI and millions of data points about you, it's easier than ever for companies to predict the highest price you will tolerate in that moment.
Digital privacy is simply the right to control your own boundaries and ability to decide who you share information about yourself with.
Remember: Data you share safely today does not sit still
Right now, as you read this, information about you is probably being packaged and sold to companies you will never see. The data extraction economy relies on tracking digital footprints, or the trail of data you generate during routine online activities.
Personal data traces come from your actions, like posting on social media, as well as passive collection, like location pings, device identifiers, and the metadata accompanying ordinary browsing.
Your digital footprint doesn't sit still. In most of the world your data can be legally traded across companies, purchased by police and government organizations, and is frequently targeted for exploit by cybercriminals as it is bought, sold, and stored.
Selling your private moments
Who you are and what you do on the internet is extremely valuable. It fuels an attention economy designed to predict, influence and sell your behavior.
Most apps collect a lot of extra information about how you use them and this data can move through analytics tools, ad networks, data brokers, and real time bidding systems that help companies target, measure, and resell your attention.
As one example, a 2020 Norwegian Consumer Council study (opens in a new tab) found ten popular apps, including dating and period-tracking apps, quietly sending personal data to at least 135 other companies.
A US Federal Trade Commission report (opens in a new tab) found that data brokers store billions of data points about individuals, combining online and offline data, like bankruptcy information, voting registration, consumer purchases, web browsing data, and more, to target online ads to people based on their everyday online and offline activities.
How targeting reaches vulnerability
Digital footprints are used to effectively create invisible gates that scrutinize you and manipulate what you see online (opens in a new tab), without your knowledge.
Advanced targeting uses your data to understand moments when you are the most vulnerable and open to influence. It can use behavioral signals to infer when you may be more persuadable, more impulsive, or under pressure. That is where privacy harms become more than data collection.
- Personality based persuasion: Algorithms find what gets a reaction out of you and show you more, even if the reaction is negative.
- Behavior targeting: Showing you "buy now" product ads when your behavior shifts and flags that you're acting in an impulsive way.
- Emotional targeting: Ads adapt to your mood, habits and stress, tailoring what you see based on how you're feeling.
- Discrimination: Sensitive data can lead to unfair treatment or exclusion, like basing loan rates or credit applications on your data footprint.
- Loss of autonomy: Choices you think you made may have been engineered.
Why "I have nothing to hide" misses the point
Privacy isn't about hiding. It's about freedom to explore, learn and be yourself without constant monitoring or judgement.
We close the bathroom door, seal envelopes, and lower our voices in a crowd. Privacy is the ordinary condition of a free person. Every day we share information and prove things about ourselves, to earn trust and build relationships. Privacy is what keeps those decisions ours to make.
Remember:
When surveillance is normalized, everyone loses. Protecting privacy today means preserving freedom and fairness for tomorrow.
The real risk of data extraction is aggregation. On their own, the books you buy, the places you go, and the things you search are trivial. Combined, they reveal things you never chose to share. A book purchase plus a wig purchase plus a visit to a cancer treatment facility can reveal a medical diagnosis.
In 2018, the US Supreme Court ruled that police need a warrant to track your phone through your mobile carrier. But the ruling said nothing about buying the same location data on the open market. Purchasing detailed location histories and digital footprints from brokers, without a warrant, has transformed how state actors conduct mass surveillance.
As just one example, US Immigration and Customs Enforcement (ICE) spent ~$2.8 billion (opens in a new tab) from 2008 to 2021 on new surveillance, data collection and data-sharing programs, including tools that harvest location data from smartphone apps (opens in a new tab) (like mobile games or weather apps) via the data gathered by mobile ads in the apps.
Privacy works best as a crowd
The more people use privacy-preserving tools, the larger the group anyone can blend into, and the more it protects those who need it most.
If private messaging or confidential payments are used only by few people like activists, journalists, and dissidents, then simply using those tools marks a person as a target.
What privacy really protects
Privacy is easy to dismiss until you look at what it actually protects.
Privacy gives people the ability to express themselves, transact with others, and communicate securely. In today's online world, protecting privacy is a foundational requirement for individuals to organize communities and participate meaningfully in a self-governing society.
Privacy can be the default
It does not have to be this way. It is possible to build systems where privacy is the default, designed so people do not have to assemble, monitor, and protect their privacy at all times. Technology that works like a sanctuary: permissionless, and within reach of everyone.
This is part of why Ethereum exists. To be clear, this is hard and unfinished work. Ethereum is a public and transparent ledger by design, which is its own privacy challenge; to solve it, Ethereum's active privacy roadmap is transitioning the network to a privacy-by-default architecture. Today, Ethereum is home to advanced privacy-preserving technologies like zero-knowledge proofs, which let you prove something is true without revealing the underlying data.
A different future is possible, one where privacy is built in and protecting it no longer takes a fight.
Getting started
It's easy to start protecting your privacy online. You can secure your personal data by switching your everyday apps to privacy-preserving alternatives.
Ethereum powers a landscape of tools that allow you to securely verify your digital identity, cast secret-ballot votes, coordinate confidentially, and more.
