How is Cloudflare a monopoly as opposed to just being popular? The CDN, security, edge compute, etc. markets all have multiple popular competitors.

Sorry, not exactly monopoly. Probably too big to fail, from what I gather, though. I don't know enough to know whether there is anyone else that could realistically compete with their scale.

My point was simply that their size is unrelated to this proposition, outside the fact they are big enough to be taken seriously.