100% of anonymity no one guarantees you. This is a modern world. For good citizens, anonymity is not required
If users of the cryptocurrency forced to pass identification, this system will not differ from the banking system

One day verification is going to be introduced anyway. Not a single country will allow an illegal currency to develop. It is only a matter of time.
Today, many renowned cryptocurrency connect and modify anonymous payments. For example ETH, DASH,Monero,Zec and others. If criminals want to use cryptocurrency, then he's not interested in the legal rules, they will find ways to for anonymous payments and exchanges.