Knowledge something will fail eventually, and knowledge of exactly when it will are entirely different propositions.
The market can stay insolvent longer than the investor.
"The stock market can remain irrational a lot longer than you can remain solvent."
The way I see it though, unless anyone is shorting cryptocurrency with 100% of their net worth I think they are at some level expressing that the world is not so clear cut. Sometimes meme stocks win before you run out of runway.