How expensive/difficult would it have been for bitmex to register with the SEC and/or CFTC? Jumped through all of the hoops, so to speak?
Also keep in mind that currently crypto is a lot bigger outside of the US, most of Asia don't want to deal touch things close to US regulators. Eg. it's why Tether is so much bigger than things like USDC (as they actively fight against US regulators in court to protect users).