Yes, you are right, this is a real problem. But it really is just a variation on 'the internet never forgets', for instance in relation to teen behavior online. But AI allows for weaponization of such information. I wish the wannabe politicians of 2050 much good luck with their careers, they are going to be the most boring people available.
The internet never forgets but you could be anonymous. Or at least somewhat. But that's getting harder and harder
If such a thing isn't already possible (it is to a certain extent), we are headed towards a point where your words alone will be enough to fingerprint you.