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.
A better way is to store only who has voted. No need to store how they have voted.
Then people won’t be able to change their minds once they’ve voted, or even see what their previous votes were.
Yes
Unfortunately, as they mentioned it would still need to know which way they voted so one can “unvote” or change their vote.