From what I've seen, the large majority of "mixers" are a scam. Or phishing. Or waiting for an exit scam.
And how do you think this could be different?
How can a mixer owner prove that he is honest?
I only see one solution. It's not hiding. Everyone knows who owns it. Of course, this can later create a personal safety issue. It certainly has to create a balance between privacy and its identity, in order to be minimally projected and at the same time be clear to its users.