This is still a bit of the wild-west.  Now you understand why Skype originally had super-nodes.  Most WebRTC chat implementations just limit the number of participants in a group.  I think <a href="https:&#x2F;&#x2F;meet.jit.si&#x2F;" rel="nofollow">https:&#x2F;&#x2F;meet.jit.si&#x2F;</a> is the exception but that just moves the limitations to the server.  The good news is that if you just do audio, the bandwidth burden is pretty low.