It's against TO to sell/trade plat with cash, and the only way to get plat is with money. Betting platinum could be viewed as online gambling.
Concerning your second point, it doesn't matter if people can use emotes, public chat is a large part of the go system. It also doesn't matter if you need to discuss strategy in FFAs. I've never seen anyone use teamchat anyways, only PM. If you're an actual FFA team, use other means of communication (skype, discord etc) like every other game in existence.
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