Which is an awesome capability, if you need it.

I suspect that if you broke projects on AWS down by the numbers, the vast majority don't needed it.

There are other benefits to using AWS (and drawbacks) bit "easy scaling" isn't just premature optimisation because if you build something to do something it's never going to do that's not optimisation it's simply waste.

They need it at the beginning to get started quickly, then they don't but don't bother moving out.

Not too different from how many other lines of business get their clients in the door.