The same thing happened when people claimed to be 99.999% sure Trump would never be president, but of course they never actually bet any money on it.
One could argue the grandparent doesn't argue their point either, but they definitely seem to put their money where their mouth is. All these people who are so against crypto and like to sit at the sidelines moaning about a bubble, why don't you either short it or bet against it? A la http://blog.samaltman.com/bubble-talk