The Bitcoin (BTC-USD) warnings are coming from far and wide following a big week that saw El Salvador legalize the crypto as legal tender. Bitcoin -0.5% to $46,087. Riksbank Governor Stefan Ingves: "Private money usually collapses sooner or later. And sure, you can get rich by trading in Bitcoin, but it's comparable to trading in stamps," he warned at a banking conference in Stockholm. Earlier this year, Ingves said that cryptos as a whole are unlikely to escape regulatory oversight as their popularity grows. "When something becomes large enough, factors such as consumer interests and money laundering enter the picture." Banxico Governor Alejandro Diaz de Leon: "Whoever receives Bitcoin in exchange for a good or service, we believe that [transaction] is more akin to bartering because that person is exchanging a good for a good, but not really money for a good. In our times, money has evolved to be fiat money