One of the most successful investors in the world has doubled down on his skepticism toward cryptocurrencies: Warren Buffet seems convinced that bitcoin and other crypto “will come to a bad ending." While his comments have already been thoroughly criticized, Buffet is probably just being cautious and not investing because he doesn’t know enough about it. Buffett said he would not take a short position on bitcoin futures. "We don't own any, we're not short any, we'll never have a position in them," he said. "I get into enough trouble with things I think I know something about," he added. "Why in the world should I take a long or short position in something I don't know anything about."