It's not hard to make your own Cloudflare-alike. I helped bootstrap this for an organization in the non profit space which now serves dozens of threatened web sites. I even created a monitoring/rotation system that takes care of much of the minute to minute work. The hard part outside state funding is making it profitable / sustainable for real emergencies. But the nature of DDOS is it's largely about fighting fire with fire so basically needs a lot of distributed hosts.

This is an area I'd like to see a peer solution be successful, a bittorrent for hosting with no central dependencies.