Part of the problem is that the government is all for this, especially law enforcement.
Iirc the bar is much lower to get a subpoena for data on someone versus getting a warrant for that same person.
This is why privacy is so important. It's not just ads you need to worry about.
This conversation seems to come up every now and again and lemmy seems to split between two camps:
Where that line gets drawn has to be an active conversation between schools, parents, and students. But this conversation often delves into "BuT tHiNk Of ThE cHiLdReN!"