I don't think it's fair to put blockchain and AI on the same pile.

There's just too much money swimming around nowadays looking for good ROI (thanks to government austerity and quantitative easing..), so even stupid things like recipe subscriptions or illegal taxis are being valued at billions of dollars.

Arguably the world's economy is a Ponzi scheme anyway, but the people in control of it will do anything to keep the smoke-and-mirrors-show running.

Dangerously ambiguous comment. Or a very subtle attempt at humor.