Since UTXOs are public on the blockchain, they are analyzed regardless if zkSNACKs is using the analysis' data or not. This is not an information that the user confidentially shares with anyone. This is public information.

> We should use, accept and spend 'tainted coins', because Bitcoin being fungible is one of its most important properties. If you start trying to get 'coins without risk of taint', you're starting to play after someone's arbitrarily set rules and not after Bitcoin's rules.

Tainting is the consequence of lack of fungibility. Fungibility is only achieved for coins those come out of Wasabi coinjoins. Fungibility: indistinguishability is achieved on coinjoin outputs, as receivers of coinjoined coins cannot make meaningful differentiation between any two coinjoined coins. What you're suggesting is a social consensus on "let's close our eyes and consider every two UTXOs fungible" which I am all for. Unfortunately, we are a minority who understand the value of fungibility and even a smaller minority who are willing to act based on this social consensus. In fact, even if there's willingness, the real world may force you to not do that anyway, just like in our case, so we must have technical solutions instead.