It's important to qualify this though. E.g. Amazon was not profitable for a very long time, but only because they furiously reinvested everything. They could've turned profitable at any time.
Assuming Cloudflare is a similar case to Amazon: ie they could turn profitable at any time but choose to reinvest those profits immediately into more business, that is a very good spot to be in.
At some point in time they'll have to start thinking about profitability.