On Firefox moving DNS to a third party | PowerDNS Blog

DNS lookups occur for every website visited. The processor of DNS requests gets a complete picture of what a household or phone is doing on the internet. In addition, DNS can be used to block sites or to discover if devices are accessing malware or are part of a botnet. (for the tl;dr, please skip right to the summary at the end) Recently, we’ve seen Cloudflare (rumoured to be heading to IPO soon)

[Rockridge]

DNS over HTTPSのデフォルトプロバイダをブラウザが指定すると、プロバイダの寡占を招き、中立性や政府の介入といった点で将来的にユーザーに不利益になるのでは、との意見。