yes, we have a matrix room for coordinated efforts against spam and other types of abuse, which admins are welcome to join.
once lemmy allows reporting user profiles directly this will probably become more likely to reach the instances admins of instances that are less actively maintained as well.
i’ve banned all the accounts i could identify as part of this scheme from lemmy.world now.
i originally sent them a warning before i was aware of the scale of this involving a bunch of alts with different usernames. if i had known that when i sent the warning it would’ve been a ban straight away.
they replied to my warning pretending they didn’t know about any recent vote manipulation, so they’re clearly not interested in acting in good faith going forward.