DoH servers are not open proxies, they're just DNS resolvers with support for a security layer; they are comparable to HTTPS, SMTPS, SSH, etc. servers, not to a

DoH servers are not open proxies, they're just DNS resolvers with support for a security layer; they are comparable to HTTPS, SMTPS, SSH, etc. servers, not to a VPN. VPNs are not a substitute for, nor a better solution than DoH in the same way as they are not for HTTPS or SSH.