In a realm of total bullshit the winners are the one who are best at lying. "I don't know what to believe and everyone involved is probably corrupt" is usually just an excuse to disengage and follow base instincts.
I agree. The parent poster didn't ask what's the downside, and I think it's this: when no one knows what to believe and starts to distrust most things, society may start to fall apart, as society relies on us trusting each other.
So while I think disinformation is one of the best privacy strategies (not so different from differential privacy efforts by Google and others, suggested by the OP but without the term name), I think the more we lie to hide, the more we spin others and ourselves in circles.
I really like Sam Lessin's essay on this at The Information, where he talks about how, with the nature of the internet being so easy to share info, we have to start spreading disinfo to even close colleagues, so far as even lying to ourselves.
I think this paradox is one of the most challenging paradoxes of our time: the internet makes it so easy for us to open up and share and yet it makes it so hard for us to not open up and share.
[0]: https://www.theinformation.com/articles/the-future-of-privac...
A similar take from YouTube (about modern-day Greece) that I happened to come across just this morning: https://youtu.be/404IeUzGNZ4
It is ALSO the primary goal of dezinformatsia and "flood the zone with bullshit" (promoted by e.g., Steve Bannon) techniques. While some will believe even the most stupid conspiracy theories put out there, many more will just conclude that finding the real truth is impossible/impractical and just disengage. This is a deadly threat to democracy and a key tool to anyone who wants to destroy a society or own it as an autocrat.
Yeah, that's how you win referenda and presidential elections nowadays.