Investing.com - Legendary investor Warren Buffett is about as negative as you can be about Bitcoin and other cryptocurrencies.Buffett believes "with almost certainty that they will come to a bad end", according to an interview on CNBC.The chairman and CEO of Berkshire Hathaway (NYSE:BRKa) said he wouldn't even bet against digital currencies by taking a short position. "We'll never have a position in them," he said. Buffett is famous for his so-called value approach to investing. His company invests mostly in traditional, so-called brick and mortar companies,He was skeptical about the dot com boom two decades ago.He has, however, invested in Apple (NASDAQ:AAPL) and IBM (NYSE:IBM).