Is there something specific you've got in mind? There are a ton of "it depends" type questions in here, but generally speaking I'd argue that rolling your own i

Is there something specific you've got in mind? There are a ton of "it depends" type questions in here, but generally speaking I'd argue that rolling your own infra has some parallels with rolling your own crypto. There are countless mistakes you can make when doing it yourself, and a reputable entity that's been doing it for a bit has probably already made those mistakes or, at least, considered them. Quadruply so if they've got certifications of any kind. At scale, or with a seasoned ops team/team member, the scenario is a bit different, but if you're asking "is it more secure for a few full-stack developers hacking at a startup to roll their own infra or use something like fly.io" I feel preeetty comfortable saying the latter is going to be more secure.