Earlier quoted context omitted.
I agree with all of that, but the other important thing (at least to me as an investor) is their 51% growth over two years (with 77% gross margin). You can have the best product, but if you're not actually growing and profitable then as much as I like the company or the product I'll put my investment dollars elsewhere.
They're growing but not profitable. It's easy to grow by giving valuable stuff away below cost. It's not so easy to grow if you're making positive margin. Given CloudFlare's size and age, why are they losing money?
I don't know for sure, but I would guess it's their aggressive expansion efforts. Those might cost more than they've returned so far. If that is the case, and since their GM is so high, they should be profitable once buildout costs start to plateau.