It is incredible how big names in the crypto world can just run away... People is still the weakest link in the chain and even though currency is decentralized everything is still based on trusting someone
Look fincen is acting in 2014 on ripple ? document of a fine for not registering at fincen?
https://www.coindesk.com/fincen-fines-ripple-labs-700000-bank-secrecy-act/ it looks like a registering is the key word at fincen, so cryptsy was ok according them.