Virtually every router on the Internet has the built-in capability to block DoT with a single configuration change, but you can attempt to create a blacklist of DoH resolvers to try to stop that, so they're totally equivalent. That's the argument you've got.
Nothing prevents Google or Cloudflare to run DoH on the same IPs as their user-facing services. Unless you are willing to block Search, for example, you might be SOL without TLS-terminating proxy.
