I work on Yarn. The message you're quoting is from the npm CTO. We don't do yarn-specific changes. The main reason we're using a mirror is because it was massiv

I work on Yarn. The message you're quoting is from the npm CTO. We don't do yarn-specific changes. The main reason we're using a mirror is because it was massively faster than directly querying the npm registry when Yarn got released. The difference decreased during the past year I think, but Cloudflare was still a bit ahead in most scenarios.