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But as we know, the main problem they have been getting clean coins from the mixer. Even bitcoin is traceable, but we are hopeless when they mixed coins. Criminals wouldn't be revealed unless regulate mixer, which is unlikely to happen. Criminals just getting advantage of bitcoin decentralization.
I would like to know if the mixer service can do the mixing if the amount of bitcoins you want to mix is large ?
As I recall, the mixer service can damage treceability a small amount but it would be difficult to do it if the transaction was larger. I read it in an article.
Indeed, I think the mixer is by far the best way for criminal to protect their privacy from being tracked. But rest assured, something that seems difficult for the moment will probably be easy to do in the future. Bitcoin is constantly being developed and so are the various services. In some cases, IP addresses can still be used as a way to track down online criminal.