I don't get it, you put that information on the internet, you have no expectation to privacy. But now maybe you learned a lesson, and you won't publicly share things you don't want people to see?
While that is somewhat true, there are multiple angles to it. The big one is expectations. It used to be that if you shared something on an obscure forum that had like 100 readers, most of those people expected that only 100 would see their posting. And it was true, so it reinforced the expectation for nontechnical people, which is basically everyone within a rounding error.
Then everything gets indexes and now fed to AI and suddenly billions of people have easy access to what they felt was very limited in distribution.
You could file this under "People don't threat model correctly", but also (more importantly) under the fact that technology should consider human nature before breaking expectations.