I don't see how doing thorough research suddenly makes blacklists and censorship "reasonable" after incessant pearl clutching and preaching how those services should be avoided.
Premium mixing. That's it. If you want to make a regular mixing, then use a software that will pick coins at random (i.e., will treat coins equally).
So if zkSNACKs called themselves a "premium coinjoin coordinator", you would have never complained about them blacklisting?