I know they aren't stupid, but they need a non-transparent, hard-to-audit business. Like a restaurant. The IRS (or the relevant tax authority) won't count how many meals you have served, and you can price it as high as you like.

Or you can just do a festival and claim that you had a lot more visitors. It's hard to count people after all, and easy to print fake tickets.

So, I simply think that ASICs are not the things used for money laundering, because their output is very constant, and the hashrate is public knowledge, so easy to verify how much money you made.