Because Cloudflare's products are very good. The issues people have with Cloudflare are more philosophical and won't be resolved by building a better product. GP's concerns would best be rectified by dozens of commodity-like competitors of similar quality.

You mean why is nobody making arrangements to put their own server into thousands and thousands of ISP datacenters?

By snuffing out competition through economies of scale is one explanation.

Because their product is awesome dude. I don’t even know where to improve it. Love it as a user.

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.