If you hit the [info] link in any chat room (just under the room's name in the upper-right of my browser's rendering) you'll see listed the room owners. In General Chat/Not A Bar it's BESW, Miniman, NautArch, and kviiri. Room owners can move messages, delete messages, and kick people from the room as matters of software permissions.
More importantly (for our use-case, since in RPG-land it's vanishingly rare that any of those brute-force tools are put to use) they're trusted and experienced members of the community.