It makes a very broad claim which makes it sound like an extortion racket but doesn't have anything to back it up. I would bet that if it included some evidence it would fare much better. For example, they have a ton of large organizations which are customers. The very first question the average reader is going to have is whether it's really the case that these sites are predominantly attacked by booter services which use Cloudflare for hosting? That seems unlikely and as general rule here the broader the claim the more people are going to expect you to show that you did your homework first.

The claim was discussed in this post: https://news.ycombinator.com/item?id=32709329

Basically DDOS booters use Cloudflare to protect their websites from competitors, since Cloudflare is one of the best. The same people Cloudflare is protecting (and claims to do so on an ethical neutrality basis) is furthering the need for Cloudflare to exist.

Note that I’m not saying whether or not this is true, only that a comment which links to something like that will generally fare better than one which begs the question.

Its like finding the worst videos on youtube and saying that's their business model.