剛剛看到 Debian Mirrors via CloudFront 這個，原來 AWS 幫忙付掉了：
This service is kindly hosted by and paid for by Amazon Web Services, and we thank them for their contribution to Debian.
翻了 mailing list 發現是在 2013 年五月的時候弄出來的：「Debian archive distribution via CloudFront CDN」。