Again, and again I see a post where the task is given to the hosts with little power.
Yes, there are known players who are extremely toxic. I assume that you're referring to their conduct in-game as well as in the lobby. Since this thread is about in-game only I'll refer to that aspect only. The comments about lobby moderation were moved to the thread titled Lobby Help and Moderation, so the discussion about lobby rules can be continued on-topic there.
"The services hosted by the players are moderated by those players. That is to say, each host moderates their own match."
Hosters have kick and ban capability, so there's not "little power" that they have. But, many hosters ignore this power and don't take action. That is the real problem. So I applaud maxticatrix for implementing rules for his games. This is exactly what more hosters need to do.