‘The NFT thingy is starting to burst,’ warns guru whose ‘Black Swan’ theory foresaw 2007 financial crisis

%27The%20NFT%20thingy%20is%20starting%20to%20burst%2C%27%20warns%20the%20financial%20guru%20whose%20%u2018Black%20Swan%u2019%20theory%20foresaw%20the%202007%20financial%20crisis%20%7C%20Fortune