Jim Cramer, former hedge fund manager and CNBC's Mad Money host, has changed his view on Bitcoin as its price exceeded $45,000. He now recognizes Bitcoin's technological importance and its lasting presence in the financial world. This shift comes ahead of anticipated regulatory approval for a Bitcoin spot ETF in the United States. Cramer, however, suggests that the ETF approval might lead to market volatility, and he notes that not all current Bitcoin investors may be in it for the long term. The price increase is fueled by speculation surrounding possible SEC approval of spot Bitcoin ETFs, with decisions expected by January 10 for multiple applicants. Cramer had previously sold most of his Bitcoin holdings.