Is this the typical behaviour of fediverse users? Posts in Apple and Nintendo communities immediately get downvoted by people disliking the companies. Can’t they just block the communities?
(media.piefed.social)
So people unsubscribed from other instances, etc could still downvote and harm a posts visibility across the fediverse.
Are you absolutely certain of that - that is not what the feature description seems to indicate? If true, that sounds like a bug request should be submitted, either to fix the feature itself or at least the description to match, although I do not moderate any communities on PieFed so I lack personal experience with this and will have to leave it to you who knows.
I would have naively guessed that it would be trivially easy for PieFed to know which users were subscribed to a community vs. not, but maybe it's in an inaccessible form or something.