"Tesla's (TSLA) action is not directly reflective of my opinion," tweets Elon Musk of his company's $1.5B Bitcoin (BTC-USD) purchase. "Having some Bitcoin, which is simply a less dumb form of liquidity than cash, is adventurous enough for an S&P 500 company."More: "When fiat currency has negative real interest, only a fool wouldn't look elsewhere. Bitcoin is almost as bs as fiat money. The key word is 'almost'."Bitcoin this morning is making new all-time highs, currently changing hands at $52.6K.Yesterday, it was Bond King Jeff Gundlach who became the latest heavy-hitter to publicly begin to embrace Bitcoin.