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.
Is this only accessible for the people who host the instance, or for all users?
Anybody with access to the database on ANY instance. It would be pretty easy to surface in the UI if someone was so inclined to code it.
Kbin was so inclined. You can see who interacted with any post and how they did right from the default UI.
Everyone, on kbin u can see who boosted , downvoted/reduced, or upvote/favourited any comment by pressing “more” then “activity”. For posts it’s at the bottom of the comment section