What's also interesting is that my post was trending in the Ask section on hackernews and suddenly disappeared from there.

It might be a conspiracy, or it might just be a lot of users going "well, duh?" or disagree with your notion. At least you can control what you put into the system, where companies like Google vacuum every behaviour from your emails, browser history, location data etc. That doesn't make ChatGPT any less problematic in terms of privacy, but I certainly don't think it's the "biggest privacy disaster ever".