Sorry, but in video, have no explain for chat, they say nothing about that, only explanation about fellowship, how to make it and how to send invite or accept, i don't see or hear anywhere even word about chat.
And if not been global chat, than they may make fellowship chat, and fellowship trade. For now members from fellowship can't help each other with resources via trade, and if they try, some other ppl will catch that trade.
I play some similar games, and always been group chat and trade in group.
That is only my opinion
and sorry if my english is not good