None that I know of.
It was a planned official feature, but I think it rather touched small battlegrounds and not the main universe.
Unofficially, I haven't seen any in the wild. Besides, the game's economy and mechanics rely on rather very massive multiplayer.
Exactly! They've made a financial model that will collapse once the release comes in and wipes stop. And they know it.
The game is essentially screwed by its very financial incentives.