I like to think this demonstrates why it's bad for one service provider to dominate the market, but nobody will learn all that much from this.
CF dominates the market - and their free tier is delightful. Oddly, a paid plan jumps up a bunch from zero, but that's not all that important. The important bit is that CF dominates the market with 82% of the CDN market - though that's only like 20% of the web.
But, it's a 'big 20%' meaning that 20% is made up of some pretty major companies.
With recent changes in the way Google handles ranking, you'll see more sites moving to a CDN and they're predominantly going to pick CF, if the past is any indication.