If by the problem you mean hackers then I can only just make assumptions. These hackers usually use their throwaway service accounts as to not get banned on their main accounts. So you're paying a monthly subscription to meme/have fun with cheats in a game mode just to get a reaction from players. Hackers have always been rare in case and usually if there is a notorious hacker its usually the same person playing on different alts using the same hacks, they're pretty obvious they're the same player. Can only guess they get bored of doing it/want to lay low because they finally did receive a ban.
PvP in this game mode speaks for itself in that not very many players actually care about it and the few that do care more than likely wouldn't bother cheating to gain an advantage as there's not very much to even cheat for reward wise. The last notorious hacker afaik did what they did because of drama with other players who they believed take the game mode too seriously and wanted to trigger them/get reactions/get back at them, etc.