It was only a matter of time, but the US is cracking down on crypto exchanges that cater to the needs of ransomware gangs. According to Bleeping Computer, and first reported by The Wall Street Journal.
It makes sense that the US will go after the organizations that allow ransomware gangs to convert their crypto currencies into the local currencies needed and/or hold the crypto wallets for the gangs. The only way to stop ransomware gangs from continuing to operate is to make operating so time consuming, costly, and risky that it is no longer worth it. These attacks have almost always been about the money, and if you stop the money from flowing, you stop the attacks.