They get a minimal set of info, like you stated, username, content of post, post time/date. The other info stays on your instance.
That’s beside the point though, the idea is to own the fediverse, but not through hacking or data gathering. EEE is the way to go here.
I wasn’t trying to make or advocate for a point I was just wondering about the immediate/short term consequences to my personal privacy.
Also what is EEE?
Embrace, Extend, and Extinguish. The term was first coined by the US DOJ, but then MS addopted it and was used internally. Basically it means that it’s a lot easier to destroy something from within than from the outside. So, you have to become “one of them” in order to set the wheels in motion.