Reply to comment:

Stéphane Bortzmeyer
"CloudFlare, Google and Quad9 all offer DoH" As far as I know, only Cloudflare does it. Google Public DNS has an experimental DNS-over-HTTPS (proprietary, not DoH) service and Quad9 seems to have "only" DoT (see https://quad9.net/faq/#Does_Quad9_support_DNS_over_TLS )