I don’t know of anyone.
It seems that since Jan, everyone has been focused solely on the kind 1 use case (for client apps), and all channel/group stuff went on hold.
There are some tough issues to solve like how would moderation work. I know we have a count kinds defined, but you really need to be able to delegate moderation, not just have a channel creator or something.
And I only mention moderation because things like off topic posts and other stuff are painful without some kind of moderation. If you don’t like that channel, start your own.