I'm in complete agreement with you, I first got scared with the potential for profiling individuals through data collection over time some 15 years ago. I was working on a very small project from a startup, related to football/soccer, where we collected behavioural and sentiment data from football fans over time, in our service and around social media (mostly Twitter at the time), and had a first glimpse on what could be inferred about individuals just based on very public datapoints they'd produce.

That project opened my eyes, and the paranoia it created in me never really went away, it's a constant thought in my mind about how much data I'm generating for massive companies creating very accurate profiles of who I am: what I like and dislike, what I access, where I am, what I'm doing where I am, every single time I click on a link, a video, etc. I feel a little dread that I provided even more information about myself to machines programmed to crunch through all of this and materialise a view of who I am as a person. Right now it's mostly to serve me ads but the potential that absurd amount of information gathering has in the wrong hands truly terrify me.

The worst part is that there's almost no escape living a contemporary lifestyle, the only way is to engage with anything digital in very, very cautious ways, trying to cover every single trace and track you might leave behind while interacting with any digital product, and that is simply exhausting.