You mean the law(s) they broke involved stealing users assets? Reminder so, terms and conditions are not law nor is there any guarantee they hold up in court if challenged.
If their terms and conditions said "by depositing your assets on our exchange you are signing them over to us" then there would be no crime at all.
Terms and conditions aren't necessarily enforceable, and they really aren't necessarily enforceable when it comes to financial services, and they reallyreally aren't necessarily enforceable when it comes to blatant fraud.