I know many public communities that use slack. A major one is MacAdmins which is legendary. Some even get sponsored by them (get free access to all features). L

I know many public communities that use slack. A major one is MacAdmins which is legendary. Some even get sponsored by them (get free access to all features). Like MacAdmins. But many don't. The problem is that the per-user model is really crap for public communities.