Edit: obligatory explanation (thanks mods for squaring me away)…
What you see via the UI isn’t “all that exists”. Unlike Reddit, where everything is a black box, there are a lot more eyeballs who can see “under the hood”. Any instance admin, proper or rogue, gets a ton of information that users won’t normally see. The attached example demonstrates that while users will only see upvote/downvote tallies, admins can see who actually performed those actions.
Edit: To clarify, not just YOUR instance admin gets this info. This is ANY instance admin across the Fediverse.
Nope. Everything you do is sent to all other instances. If you upvote your instance sends that upvote to the instance where the community lives and that instance broadcasts your vote to alle instances that subscribe to that community. Every instance operator can see the upvotes.
Well then nevermind! I need to go read about activity pub protocol.
At least your password hash not accessible by anyone but you… and your dm is also only accessible by your recipient and his/her admin… 😅