Generally speaking (I'm not a fly.io customer) at this point that phrase WORRIES me as a customer of any service.
It makes me think that the company exists just on a constant flow of VC or similar money and what I'm using or paying for isn't a realistic or future cost and I'm involved with a system or platform that is getting stretched larger and larger regardless of income and the more money they raise the harder the fall will be.
It's unfortunate but for me it's not a phrase I want to see. I want to hear how they are profitable based on their operations and paying customers or other non VC or IPO type income. That gives me confidence in their stability.
To be clear that's not a disagreement with the title or blog, seems like a fine article that is fairly up front, but it's hard for me to really see "we raised a bunch of money" as a positive from a customer perspective anymore.