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There are other CNDs, and Cloudflare isn't event the largest one, it has best marketing and free solutions.

Cloudflare provides so much more than just CDN, and in a very nice package

As do others, they had to because CDN is not that good source of income nowadays, so most went into other offerings that are more profitable.

As I wrote, Cloudflare excel at marketing. And offers to consumers (as opposed to B2B).