Hard to say. I'm sure that accounts for some of it, but at a certain scale, having a system be tailor-made to fit your requirements and workflows has a lot of

Hard to say. I'm sure that accounts for some of it, but at a certain scale, having a system be tailor-made to fit your requirements and workflows has a lot of value. And if you tend to be towards the leading edge of scale and tech, the tools that you should be using don't exist yet or aren't known at the time without hindsight. My shop wasn't even that large, and we built our own k8s because we needed it. Looking back historically, it was even available at the time, but definitely not as the robust and popular standard that it is today. And once you have a whole system built, you're really going to have a hard time justifying re-doing your whole architecture to move to a product that does the same thing. Basically that only happens when you have a new head of engineering who comes in and goes, i don't care how many engineers you have to throw at it, and i don't care how much custom functionality you depend on that you lose, just figure how to replicate everything you do today using k8s.