@timbray I think the key, and the drum I keep beating because more people need to realize it, is:
#Mastodon, #Fediverse, and #ActivityPub were built on the assumption that you have no #privacy here.
Anything you post is available to the world, no matter what settings you might choose for the post, no matter if you try to delete content, etc. That's just how the system is designed for better or worse.
(And I think for worse)
People should not post on such a fundamentally public place and expect privacy. That they do is a really big deal to me, that they're not informed about how the system works in this regard.
But since they are posting so publicly, well, public is public.