So why are you so hateful about zkSNACKs implementing a mechanism that extends a small protection to victims of crimes who can't defend their stolen coins anymore?
Because it doesn't protect anyone. If a criminal sees that his coins are refused to enter the coinjoin, he will simply mix them elsewhere. The coins aren't returned back to the victims, and likely never will.
There's no debate necessary since there's never a reason why you would send your coins to someone else's wallet in the first place - The whitepaper immediately informs every new Bitcoin user that there is no need to go through a financial institution and the main benefits of Bitcoin are lost when you use a trusted third party
There's Bisq, a decentralized, self-custodial exchange. You might want to call every user and affiliate of Binance, Coinbase and Kraken a scammer, at this point.
That's my exact point: A "mixing site" is just someone else's wallet. Unlike exchanges or casinos, a "mixing site" is not a service since there is no underlying purpose for the site's existence.
I understand you're fixated on dictating what people can and can't do, but the simple fact that people use them is undeniable proof that they provide a service. For example, there have been mixers in the past that charged no fees at all, not even the mining fee.