I've worked on the reliability team at a place that made what they call an "edgy app" (long before fly, so we made our own stuff on baremetal) and to be fair, reliability is the actual challenge when you're talking multi-region seamless deployments of scalable web platforms. It makes or breaks that kind of product at least for the original market.

Money doesn't contribute all that much to solving it though. It's usually time to make the early mistakes, continuous improvements, etc. But AWS had several decades to solve this, whereas fly clearly hasn't, so I'm not sure I'd count them out yet.