If you're in the US, you can't trust your ISP (most of them farm DNS data), and shaking your fist at the clouds won't change that. If you don't Cloudflare or Quad9, stand up your own DoH server somewhere; it's trivial to do.
Actually, most Quad9 users (in so far as we know, since we only know from those who contact us) are already running their own local caching resolver, and many of them are doing QNAME minimization, which is excellent. They use us to keep their cache misses from going in the clear, and because many of them have small enough user populations that their resolver still exposes individual user behavior.