For one, you're falling towards the "preparedness paradoxon".
But much worse: Yes, we absolutely have examples in the real world just how fucked up surveillance can get. The GDR's Stasi for example tracked people, just using people instead of technology, to an insane degree. Erich Mielke would openly drool in his grave if he knew just how powerful technology has become. In recent times, look at China and their "social credit" score.
Don't believe for a single second the US is unable to sink that low. Even decades-old stuff believed to be safe can be struck down with the stroke of a pen of the Supreme Court. Get your expectations codified in a constitutional amendment, or be prepared to literally have to fight for your expectations. Abortion was just the beginning.