Hey. Best way to get rid of those would be to simplify report their names to a GM in a ticket or in sunwell's discord #support channel (maybe add some names and proof here too)! Moderators can only moderate global chat and discord.
Suggesting a discord channel where we can post ninja looter's names in heroics with proof (SS)! Like it's obviously not nice to farm that one heroic once a day for quite a while and when you finally get that item ... At least that, since it's only punishable in raids. That way others can avoid those and teach them that's a bad and shameful thing to do. Thanks.