Could you elaborate on your point of them using Cloudflare ?
My understanding is that their websites would be behind Cloudflare for their CDN and anti-DDoS services, maybe WAF as well. Solely looking at CDN services essentially the options come down to Cloudflare or Akamai who have a global domination of the market.
Are you able to view YouTube at all with NoScript enabled ? When I tried it out last the page itself doesn't load because everything is JS based.