this post was submitted on 03 Oct 2023
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Hold on, these are orthogonal technologies.
DNSSEC signs DNS records so you know they're genuine and come straight from the authoritative nameservers for the domain.
DoH encrypts DNS traffic so nobody can eavesdrop on what domains you connect to, and masks it as HTTPS traffic so providers can't block it to force you to use their nameservers.
Regarding adoption: you can give a user DoH in the browser without them having to know about it, but you can't enable DNSSEC for a domain owner or nameserver admin without their explicit approval. This will naturally lead to some adoption disparity.
Actually, that's a pretty decent explanation of why they only want to use DoH. Makes sense to me now, cheers.