#Fediverse/#Mastodon is, by design, very open with basically no privacy protections.
It's a public broadcast model, with almost everything you put on here being subject to being broadcast to all other instances that are interested.
If you want to control where your content goes, don't use Fediverse.
It really is that stark.
I assume #Meta has already been vacuuming up all of this content we've been broadcasting here.