If enough of the market participants act stupid, or at least in predictably irrational ways, it may be profitable to capitalize on that behavior.
If you look at previous fads, all the way to be dotcom boom of late 1990s, this very approach seemed to work well for a number of buzzword-compliant pre-revenue "businesses", and their founders / owners. There was a crash after that, but the wisest were able to shield some of the money from it.