It’s kind of a blessing and a curse. The larger a CDN is the more resilient it is to e.g. DDoS attacks which hugely favours Cloudflare. It unfortunately also means if anything happens to Cloudflare most of the internet will go down even though the internet itself should be decentralised by design. What can happen to Cloudflare you might ask. Well anything. Being purchased by someone like Google would be bad for privacy, an incident could force Cloudflare to go down for an undetermined amount of time like what happened to Facebook a while back.