The problem is that it’s actively worse than Reddit. While only Reddit employees can access your data and it’s being sold to the highest bidder, Lemmy sells your data for $0.00.
Anyone can become an instance admin through their own instance, so your voting data is pretty much unprotected. That is the opposite of privacy. I get that it’s a consequence of the fediverse, but then it just may not be the solution to social media.
Still you can easily and quickly check if a user has voted on a particular post. While your method makes the tracking process quite a bit slower, it doesn’t make it unrealistic. There just aren’t that many users and posts as is the case with passwords. Still 100% better than the current approach, I hope this gets implemented.
YSK: Your Lemmy activities (e.g. downvotes) are far from private (i.imgur.com)
Edit: obligatory explanation (thanks mods for squaring me away)…...