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The mod banning these users is the same mod who made the posts they downvoted. This is mod abuse, turning the downvote button into an auto-self-ban button.
The message is "If you disagree with me, you will be banned"
Monitoring and banning users for using lemmy as intended to signal boost your opinion should be grounds to have all mod privileges removed. This behaviour undermines the integrity of the server and the wider fediverse.
What about double spending?
I don't see how replacing a unique id with a unique hash would have any effect on that. Even if you use a variable hash (that would change every time you change your vote) you just have to make sure that the backend properly removes the old value on a new call.
My point is that if a U user is on L local instances and R remote instance gets the vote, how does R know if U is double spending or not?
I see, guess I underestimated the problem a bit, I have to think about it some more.