I mean that the zkSNACKs coordinator can decide to reject certain outputs from the coinjoin process. When I say "you", I refer to zkSNACKs, because as per your claims you are a contributor to Wasabi project.
And that is not bad. It is true for every coinjoin implementation. The bad part comes when the privacy focused company shares permission with a company that has opposed interests and now that company has power over who is allowed to gain privacy. Do you agree that a company with opposed interests to enhancing Bitcoin's privacy, gaining the permission to tell who is allowed to have privacy is an inferior status of a privacy company?
I don't speak on behalf of zkSNACKs. As for my personal opinion, I do not care if my coins are joined with any other individual, but since I haven't been inconvenience by any blacklisting myself, I don't really have a reason to complain. However, there are people who would opt out of using privacy tools if those privacy tools would "provide cover" for criminals or cause them to "inherit taint", so some would consider this superior service:
Something to think about.
It might be safer to leave them alone. Tumbling with Coinjoin and mixers might mix your coins with the coins of criminals, black hat hackers, and dark market drug dealers.
But think about it, tumblers and coinjoins are not cheap, and who would be willing to pay for them to keep their privacy?
I believe an ordinary user would be digging himself into a bigger hole if he mixes his coins with what usually would be the criminals' coins.