> My only gripe is Cloudflare has to /store/ content on its servers, so it's not really an ISP in the traditional sense.
Traditionally (at least in my experience), back in the pre-HTTPS-everywhere days, ISPs often had Squid proxies, sometimes optional (had to be manually configured) and sometimes "transparent" (the ISP's router forcefully forwarded all connections matching TCP destination port 80 to the Squid proxy). IMHO, that's a close enough analogue to Cloudflare's main business.
Traditionally (at least in my experience), back in the pre-HTTPS-everywhere days, ISPs often had Squid proxies, sometimes optional (had to be manually configured) and sometimes "transparent" (the ISP's router forcefully forwarded all connections matching TCP destination port 80 to the Squid proxy). IMHO, that's a close enough analogue to Cloudflare's main business.