On Amazon AWS you can fire up an expensive server for half an hour or even ten minutes, to do some calculations that would otherwise take days. You can even fire up 100 of those servers for 1/100th of the time if you can do that calculation in parallel.
This all can be scripted, and that makes it very powerful.
Another use case is Streisand, the VPN service that you can install on your laptop. You need an AWS account, keys etc, and then you can start up one small server as vpn for one or two hours, or for twenty minutes, each time with a different IP, from data centers all over the world. Need a server in Asia? In the EU or the US? It can set this up within the minute, if you have it configured properly.
So there are use cases for these services with price per minute. The problem with Scaleway is that they don't have the really expensive servers, and they don't have the scripting if I'm correct. I do have a server running there, cheap and not in the US, and it does its job properly.