To above poster: You're still recruiting people to join arena, just see it as 'Looking for people'.
Yeah leech can be sold in both LFP and TRADE, as it is both. You're selling a service that involves making a party.
However kinda automatically I've used LFP and been like
"LF1M ACV, 25g/run"
As for your other points, there are few types of people who do it.
- Newbies to the game, and genuinely have no idea that they're using the wrong chat.
- People who have been using the right chat for a while but have not been having much luck. Maybe they'll use world once out of many times.
- People who just don't care.
- Mistakely once using the wrong chat, can easily happen.
I think only really the type of person in red should really be muted. However is it worthwhile to have a chat police?