Is the concept real and are there Bitcoin circular economies (BCE)? Or is it like some YouTube vlogger bought a pizza with Bitcoin somewhere to conclude that the whole town/province/country is BCE?
In particular, I am also interested to hear how sustainable are they without regular Bitcoin injection (as charity, not trade surplus) from some outside party (donor)? And do they usually survive a brutal bear market or just rise during bull runs like flash in the pan and then liquidate at a 50% drawdown?