My understanding on this is yes there will be multiples in some cases. But you could subscribe to all of them. (I personally don't think there will ever be a million funny's as it a pretty broad title.) If you want this community you should make it! I'll join!
One case I see this being a good thing could be regional stuff. Like say a community based on a local eSports league, you wouldn't have to worry about all the other leagues taking the good names. You just name it eSports and people from your city join your eSports community if they wish.
It really is small(ish) community focused, instead of Reddit's massive communities.
This game is looking to be really great. Genre bending city builder/ mining exploration/ tower defense?
Wishlisted already!