The digital ecosystem in which our daily lives are immersed seems to have the usual watchword: free. We use free apps, free platforms, free services; the reality, however, is quite different.
The façade of the free service hides a hidden price, which we pay in terms of the personal information we disclose: behaviour, preferences, habits, movements. Data currency fuels a gigantic industry and, at the same time, becomes one of the most underestimated attack surfaces in the world of cybersecurity.
Understanding how this mechanism works is not just about digital literacy. It is self-defence.
Digital crumbs: what we leave online without realising it
Every action we take online leaves a trace. You don’t need to do anything in particular: simply scrolling through a page, opening a photo, watching a video or staying on a site for a few seconds longer is enough.
These are everyday behaviours, seemingly insignificant, but which represent valuable data for those who collect them.
Platforms use telemetry systems, which constantly track how we browse. The most common information includes:
- Time spent: how interested we are in a piece of content.
- Interactions: clicks, scrolls, taps, likes.
- Geolocation: where we are when we use a service and how often.
- Social patterns: who we interact with and how we do so.
This is not ‘random information’. It is the raw material of an industrial process aimed at predicting and influencing our behaviour.
Cookies and fingerprinting: the tools that make all this possible
Cookies are just the tip of the iceberg. There are technical ones, which are essential, and profiling cookies, which follow us everywhere. But modern tracking goes far beyond that.
For example:
- Third-party cookies, which build a profile across the websites we visit.
- Unique identifiers, stored on the browser or device.
- Fingerprinting, the most insidious technique: it collects system details (resolution, fonts, browser version, plug-ins), creating a sort of “digital fingerprint” that is almost impossible to erase.
It’s like having a digital tax code that every website recognises automatically.
Why everyone wants our data: the real value lies in profiling
Collecting data isn’t about ‘getting to know us’, but rather about predicting our behaviour. It’s the least visible, yet most important, part.
This is how profiling works: thousands of data fragments are combined to build a model that represents us as users: not what we say we are, but what we actually do.
With this model, companies can:
- Display targeted adverts at the exact moment we are most likely to click.
- Personalise the experience, making it so convenient it becomes addictive.
- Influence behaviour, selecting the content most likely to generate specific reactions.
All without us even realising it.
When tracking becomes a cybersecurity issue
Huge accumulations of data create an equally huge risk.
Every platform that collects information becomes a perfect target, and when one of these systems is breached, the impact is far from trivial.
Stolen data can fuel:
- Extremely realistic social engineering attacks, because they are built on real, up-to-date and personal information.
- Synthetic identities, used for financial fraud.
- Targeted attacks against companies, starting with employees, their devices and their habits.
The more detailed the user profile, the easier it becomes to manipulate them.
It is not personalisation. It is lock-in.
Extreme personalisation is not a service; it is a lock-in mechanism. The more a system knows you, the more it becomes ‘tailored’ to you, and the harder it will be to break away from it.
It is a relationship of dependency, where convenience masks the loss of control.
How to truly protect yourself (without becoming paranoid)
The most effective defence is not technical, but mental. The first step is to understand the difference between what is necessary and what is superfluous.
Here are some useful, realistic and sustainable practices:
- Accept only necessary cookies, rejecting unnecessary profiling.
- Use privacy-oriented browsers, which block trackers and fingerprinting.
- Check app permissions, especially for free ones: if a torch app asks for your location, something’s not right.
- Use a VPN when needed, to reduce the link between your identity and your activities.
You don’t need complex tools. You need awareness.
The hidden cost of ‘free’ digital services
The real question to ask isn’t ‘what am I using?’, but ‘what am I giving away?’. Data is the fuel that powers platforms, services and an entire market built around human behaviour. Protecting our data doesn’t mean isolating ourselves; it means taking control of our digital identity.
In a world where everything seems free, we are the product being traded.
That is precisely why we cannot afford to give ourselves away without realising it.
By Federico Branchetti – Cybersecurity Developer, Cyberoo
