From the operators point of view, Cloudflare is cheap and often used when you don't understand that "premium bandwidth" or whatever they call it these days, are just bandwidth you pay way too much for.

From the users point of view, Cloudflare will frequently stop you from accessing things and introduces more single points of failure in the internet infrastructure. But on the good side, they have pretty good edge endpoints so your browsing might be a bit faster, when they allow you to browse.