Regulations on cryptocurrency in the US are more stringent than other countries, and also vary from state to state.
The SEC and crypto exchanges have clashed several times in recent years, with some exchanges facing investigations by the financial agency. The main sticking point is the SEC's classification of virtual currencies. In 2017, the SEC announced that many crypto tokens represented investment securities, which must be registered with the SEC. The agency also argued that crypto exchanges should register with the SEC as securities trading platforms.
The additional regulatory burdens and threat of lawsuits from the SEC have prompted several crypto exchanges to pull out of US markets.