In Cloudflare's case they already have a consumer-facing product that supports relaying over their network (WARP, with separate IP range versus their reverse pr

In Cloudflare's case they already have a consumer-facing product that supports relaying over their network (WARP, with separate IP range versus their reverse proxy service) so Apple is likely using a variant of that. I was very surprised when I checked and saw Fastly on my iPad as I wasn't aware Fastly had any similar product, in my mind they are (were?) strictly a reverse proxy CDN.