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Even if you don’t log in, Facebook can tell that you were looking for something on a third party site.

And that was something that apps on iOS tried to do - see what other apps you were using by opening a url - Apple started restricting that years ago.

reddit in mobile forces you to use the app

Not old.Reddit.con

> They can share all your activity with whoever they want.

Ummmm.... You are aware of the GDPR?

Your data cannot be shared with anybody without your explicit opt-in consent. If you choose to give this consent, then more fool you.

Except for the government once the EU passes Chat Control…