What you don't see much of is conservative investors who are super hot on crypto. Not necessarily because of anything about crypto, per se, so much as because part of being a conservative investor is that you don't really get super hot on anything.
Betting with the momentum works unless (A) you're a latecomer to a ponzi scheme, or (B) there's a reversion that catalyzes longstanding doubt about an asset that has enjoyed a bull run. Both of these cases may well be applicable to a large portion of the overall crypto marketplace.
https://finance.yahoo.com/video/charlie-munger-crypto-whole-...
There are also levels of conservatism: Buffet still takes risks. In any given year, there's a possibility that he loses money, even if he's amazing in the long term. This is very far from the extreme end of conservative investing where, for example, someone 2-3 years away from retirement shifts all of their investments into a low-yield guaranteed return investment to ensure that a temporary downturn in the economy doesn't wreck their ability to retire.
That statement is demonstrably false. There are two reasons to not be invested in cryptocurrencies at this point in history. You are either ignorant of the technology (which is fine, lots of more important knowledge out there), or it doesn't fit your current risk profile.
There is not a knowledgeable person on the planet who would say that any investment in any cryptocurrency is bad for all investors.
