Re:DNSCrypt – A protocol to improve DNS security
by tresni on Sunday April 02, 2017 @01:17AM
(#14015916)
Definitely this. Also lots of weird hardware/software out there that tends to discard packets it can't understand (i.e. this doesn't look like a DNS packet going to port 53, let's drop it.) 443 generally works as it is expected to be encrypted by most middleware.
I would also say that most DNSCrypt-capable providers I know of can also do it on port 53.
Putting it on 443 forces a choice between letting people manage their own DNS or blocking every store on the planet.