I saw this discussion in the comment section of some post, and it was about what the vote should be used for and how there is no official guideline for how to use it. I thought this was such a good question, that it deserved a post of its own. Related question would be if there should be multiple scores with different meanings, through which posts can be sorted.
I personally would love if voting was restricted to members of a specific community. That would truly help augment the signal/noise ratio. Practical example: it's not uncommon on /c/anarchism to have stalinist fanboys come and mass-downvote all they can find... except our forum is not intended for them to consume/judge.
Interesting idea. How can you automatically decide who the intended users are? Maybe a mix of having the community subscribed, and having a certain amount of comments, or a certain amount of upvotes within that community?
Instead of blocking the votes, you could count them differently. But I think this makes more sense as a parameter for federation between instances, not something specific to communities. In your example you could still federate with the people that behave badly in your instace, but assign a low value to their votes.
Interesting idea ! Then the votes would have the meaning that the post/comment is (not) appropriate in the community in question.
espcially all the tankies from the lemmygrad instance