Yes, but KYC is a process where the service provider is making that determination. Either to a legal standard and/or their own standards.

In no world does "KYC" mean "expose your customer list to the whole world", let alone undermine the entire purpose of the product you're selling.

"I want to dox all of the customers of a proxy provider" is just an unreasonable ask. We wouldn't expect or want ISPs or VPNs or telecoms to do this.