So what? All the coordinator can do is just not register that UTXO because Wasabi hides that user's xpub address and IP address. There's absolutely no risk to the user whatsoever.
Why isn't denial of service an existent risk to you? Someone needs privacy, but for some reason chain analysis don't approve that. How can you not see the irony that they supposedly are in favor of fungibility, but don't treat the currency as fungible in the first place?
Honestly, I'm going to shift the status quo to another question: Considering that governments are hostile to mixers now, how do we know that coordinators will also be safe?
Coordinators that fund surveillance companies which are also funded by government spending can sleep easy.