I have a question. A lot of people say zcash and monero are good ideas because bitcoin transactions can be traced. But if that is so, then why is it that when a darknet site that deals in a lot of cash, like silk road, gets shut down by the the authorities, it always seems to instead be due to an opsec failure?
Bitcoin can be mixed. Monero does the mixing on chain from what I understand. Zcash is not something I would say is a good idea because it relies on the initial keys being destroyed to know that more is not being created as well as being hugely premined.
Can't really see any reason to legally mix so I'm guessing especially in large quantities. I would imagine if your pulling money out of an exchange and your money touched a mixer you're probably going to have to answer some questions.