Genuinely curious:
What actor, in 2025, would exist in your threat model for DoH ... but wouldn't simultaneously be sniffing SNI ?
I can't think of any.
I cannot think of any good reason to be serious about DoH and DNS leakage in the presence of unencrypted SNI.
What am I missing ?
It is also public knowledge that certain ISPs (including Xfinity) sniff and log all DNS queries, even to other DNS servers. TLS SNI is less common, although it may be more widespread now, I haven't kept up with the times.
they not only intercepted your traffic for profiling but also injected redirects to their branded search. honestly curious if you're just too young or was one of the maybe 10 people who never experienced this.
sending traffic to a third party like quad9 is much safer than to a company who have your name/address/credit card.