There is no financial institution that doesn't abide with set of law guiding the activities of the institution and before tumbler or a mixer will operate in the cryptocurrency ecosystem, it must be issued with a license and the license would be giving to it when they have accepted to obey the rules and meet up the requirements to operate.
LOL. Not a single mixer operates with a license... I'm not sure a single one has, ever. Again, operating under the conditions of which the license is provided largely defeats the purpose of a customer using the mixer in the first place. I know you don't understand what I'm talking about. That's OK. I think the best solution is for me to put you on ignore.