@Captain Caveman
If a human can see something on the web, "spiders" (bots) will see it and report it to their owners. This has been going on since years before the Google search engine was made available to the public.
It's easy to test: make a post with an easy search term, come back in a day, and try to find it with google.
If you find it, they've saved your post. And every other post on the site.
And every post on most other sites on the internet. And, for example, all of your Gmail emails - that's why they provide that "free" storage with Gmail.
It's quite difficult for a site to defend against this. Very few do. If many did, the spiders would get better, so it's unlikely to ever happen.
AI's won't change what big players have access to - particularly Governments. And while they'll make it easier for Data Brokers, they won't add as much as you think in terms of access or analysis for big players.
What current AI tech will change is that they will make medium and large companies able to do what Governments already do.
Note that this was all decided (largely by inaction) when "toxic safety and security" became a political norm.
It might have been possible to resist Governments doing this for themselves (e.g. in the USA). But the combined interests of Law Enforcement, Government Security Organizations, and the (foolish) principle among voters of "100% safety" was impossible to resist.
Online privacy wasn't taken away. It was given away without a second thought by people who ignored sensible, well argued, well presented warnings.
BTW: turning off "optional cookies" doesn't help against big players, and much less than you'd think against smaller ones. Soon enough, if not already, it won't help at all against AIs.
The right to choose which cookies are saved is real, but it's also a distraction. It has an effect, but it's much less than you'd think. Cookies don't hide data like e.g. this post, and don't stop a spider copying them to their owner.