This particular phrase makes no sense in this place. Do you want to define us how you recognize "dirty" funds?

Here are a few questions:

• Were the funds frozen because they were part of a mixer's transaction?
• If yes, don't you find it offensive to confiscate customer's money because they chose to protect their privacy?
• Are you willing to tell us the criteria you identify "dirty" funds?
• If not, don't you find it fraudulent from the customer's side to, not only disapprove but also confiscate their money, just because it doesn't meet your potentially arbitrary criteria?
• Had you ever thought of asking the user's inputs, so you can judge if you can accept them according to your criteria?