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)
That only impacts communities on Piefed locally. So people unsubscribed from other instances, etc could still downvote and harm a posts visibility across the fediverse.
In any case, I personally haven't identified post downvoting on the whole to be that much of an issue that it is impossible to not notice repeat downvoters by just checking posts a few times a day for a week. Not many people do it.
Obviously if you are running a controversial community it might be different.