I don't know about funds gotten from promoting mixers since the last US government (not talking about the present one since we are yet to find out what their stance on mixers is) could turn the case in their favor by simply telling the court the fund was gotten from promoting an illegal business/service. 😁
Let's ignore the powerful for a moment, but let's look at us, ordinary people.
For example, you develop a web platform for my legal business. I pay you with Bitcoin, which previously went through the mixer and maybe at some point before it came into my possession, that Bitcoin was marked as tainted. It happens that your funds are blocked.
So, after 6 months of your legitimate work, I paid you everything regularly, but your bitcoins were seized because of some of their ancient history.
How reasonable is such treatment?