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.
If you ask me, I’d make upvotes/downvotes public overall. Always hated how on reddit some miserable people downvote lots of innocent stuff, hiding behind their anonymity.
Lemmy & Reddit are public discussion platforms, everything you do here should be public, it’s not like you use them to store private information.