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.
That’s not true, it’s just very computationally expensive to make it secure and private. There are cryptographic solutions these problems.
Good luck building a performant version.
Although I’ve always wondered why someone hasn’t built a Tor version of Lemmy/mastodon yet… imagining no home instance control, you’re just donating hosting to a truly decentralized website that nobody controls but anyone can post to. It works be the ultimate dissent tool.