I'm not the OP, but I'm not sure why they included MaxCDN and Fastly but not (at least) CloudFlare's free service.
Disclosure: I work on Compute Engine (though I had nothing to do with this service).
Disclosure: I work on Compute Engine (though I had nothing to do with this service).
$ whois speedchecker.xyz
Domain Name: SPEEDCHECKER.XYZ
Name Server: LEE.NS.CLOUDFLARE.COM
Name Server: PAM.NS.CLOUDFLARE.COM