Did users pay them a fee for a service. If so the way the Feds work it will be a slam dunk on prosecution.
Note I didn't say it was right, I said it would be a slam dunk. Federal juries are told what to judge. They obey.
Discussion
They are prosecuting software developers. It's like prosecuting a knife salesman because his customer killed someone, it's insane.
People should just use decentralized coinjoin services, like joinmarket/jam.
Did those developers charge for the service?
Stop thinking I am not on your side here, I am talking about the way things are not the way I think they should be.