you must be joking, King JR.
admins/devs ban entire clans of players semi-regularly when the entire clan is cheating, or sharing accounts, or enabling cheating as a rampant issue. I've seen that happen like 2-3 times in the last 4 months alone I think. and it's not in the past, it's in the present, lol. clans are part of halo no matter what, and they aren't as cringe universally as you're making them out to be. I think you have some skewed views of the space that clans actually occupy in the Halo community overall, and I really don't think that anyone is anxious to ban groups of fairly active players for no good reason. when it's an endemic or systematic issue, devs do take action, but it's really not an issue most of the time.
Chaos Gulch will show you the way.