> Cloudflare, which hosts a considerable fraction of the Internet's web sites, reports that 33% of its connections are using post-quantum crypto as of January 2025.

DJB's narrative is a little selective here: Cloudflare has done some incredibly impressive things with post-quantum key agreement, which is arguably the "easy"[1] part of moving the Web PKI/TLS to a PQ setting. But key agreement doesn't tell the parties why they should trust each other; you need signatures and certificates for that, and those will need to be PQ-ready too.

That part is much harder, for both technical (larger certificates implied by most PQ signing schemes are much harder to reliably convey over packet networks) and political (the X.509 ecosystem moves very slowly, and penetration of new signature schemes takes years) reasons.

[1]: Nothing about it is easy.