This company in South Korea is figuring out that once a cyber criminal, always a cyber criminal. They found that two separate big crypto crimes shared the same exchange account for onramping or offramping. Of course most of it was done with Bitcoin. Don't know how it will get better before getting worse.
https://thenews.asia/hyungoo-kim-tracking-cryptocurrency-cyber-crimes/But I guess it would be hard to track those money that had been mixed in certain crypto-mixers such as Chipmixer. It strengthens a certain crypto's anonymity and deletes all of the possible footprints of where a crypto came from. But if such algorithm or an AI would be made to track each and every possible bite of footprint from a certain crypto wallet, then it isn't just criminals that could be arrested, but also those whom used mixers to mix their money for a better privacy.
It is really impossible to track all lurking criminals out there that uses Bitcoin/cryptocurrencies for their activities. Making it possible would risk the anonymity of the crypto users and even the whole crypto-world itself.