IMO one of the benefits of a platform service is that you get the whole platform from one vendor, so if you're having some problem, you can work with one vendor

IMO one of the benefits of a platform service is that you get the whole platform from one vendor, so if you're having some problem, you can work with one vendor to sort it out. Trying to get Google support to work with a 3rd-party vendor and my hypothetical company on an issue sounds like a nightmare. There are already many other options for platform services which provide e.g. Everything you'd need to run a Rails app in dev and prod, so that's where the bar is.