True. Some of those trolls are actually employed by rival casinos which is why valid proof as you mentioned helps a lot.
It's the case with most of casinos where reputable and legit casinos are targeted by spammers without any valid evidence and just trying to defame them so people start arguing about it and raising concerns but that doesn't helps a mot because the players who are gambling regularly with casinos like Roobet know they won't scam them with few hundred or thousands bucks unless players have violated any of the casino terms or trying to cheat them.So trolls should be ignored without giving much attention to them which they desperately need.