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.
Yeah, I admit that sounds reasonable.
Although that still leaves the question of “is it scalable/performant?” on the table… Lemmy already suffers a lot from server overloading, adding the overhead of cryptographic hashing (anything less than that is not going to ensure uniqueness/true anonymity) to each act of voting surely isn’t going to help.
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Hashing is a normal part of the web, it’s easily scalable.