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DNS-over-HTTPS performance | Blog https://www.samknows.com/blog/dns-over-https-performance
> The cause of this is almost certainly the ISPs' CPE hijacking DNS requests and redirecting them to the ISP's own DNS servers. This is perfectly possible on Do53, precisely because the traffic is unencrypted.
ｵｴｰと思ったが、もしかしてこれ違法自ポサイトみたいなのをブロックするためとかで活用されてるやつじゃろか (知らんので勝手な想像)
www.samknows.comDNS-over-HTTPS performance | SamKnowsDNS-over-HTTPS promises to prevent eavesdropping and manipulation of DNS traffic. But this has side-effects that has many ISPs concerned. One of their concerns centers on performance and the impact on their CDN relationships. We've conducted an initial study of DNS-over-HTTPS performance from homes across Europe to help separate fact from fiction.
少なくとも日本でやってても不思議ではないし動機もありそうだしそれらしい言い訳と正当化もできそうだと思った