Because their "product" isn't one born of actual needs and has to do with inherent weakness to the way internet and some protocol works.

Using Cloudflare is not a permanent fix, just a bandage, and it's particularly bad that they'll use their quasi monopoly into strongarming business to pay large fees. It's basically racketeering, legal.

If we are talking about the CDN and associated "software", last time I checked (a long time ago admittedly) it was nothing special.