the whole idea of anonymity at the internet is better for everyone, especially for criminals. making an instrument which can be used for both good and bad purposes sounds a bit concerning. moreover its not possible to control it.
I do not think that anonymity is necessary for criminals. People for many reasons want to remain anonymous. And not necessarily that they are doing something bad or illegal.
Yes, here in general, crime does not play any role, let's say just the investor himself does not want to know about him and ask him a lot of questions