OpenAI CEO Sam Altman warned in a podcast that the U.S. government is waging a "war" on cryptocurrency, aiming to "control" Bitcoin. Altman is concerned about how far surveillance states might go in the realm of currency, and he believes it is crucial to have a global currency like Bitcoin that is beyond government control. However, he has faced criticism from the Bitcoin community for his involvement in the controversial Worldcoin crypto project. Altman opposes central bank digital currencies and expressed deep sadness over the U.S. government's crackdown on cryptocurrency.