Honest question: what would a backdoored mixer look like? If it had a list of trapdoor addresses (or checked addresses in real-time) and made last-minute transa

Honest question: what would a backdoored mixer look like? If it had a list of trapdoor addresses (or checked addresses in real-time) and made last-minute transaction changes, say. Would any criminal risk complaining if it identified them? Does the tumbler’s reputation have a mechanism for angry criminal user stories? The tumblers seem like a centralized chokepoint for criminals trying to launder.