Um, in Germany the main news program (Tagesschau) posted an article in which is said, that Buffet himself says, that he doesn't really understand cryptocurrencies, but nevertheless thinks, one should not invest in them. Just saying.

Quote: "Buffett räumte jedoch auch offen ein, sich mit Bitcoin und Co. nicht sonderlich gut auszukennen. "Doch ich denke, was derzeit abläuft, wird definitiv böse enden.""
Free translation: "Buffet admitted, that he doesn't know much about Bitcoin & Co. "But I think what's happening right now will end badly.""
(https://www.tagesschau.de/wirtschaft/buffet-kryptowaehrungen-101.html)