>However, I have no idea how Scaleaway is getting away with selling a Bare Metal server with 6 cores, 8GB memory, and 200GB of SSD disk for 10 euros a month. That's just doesn't make any financial sense.

Where are you getting that from? The hardware is ancient and completely worthless. They could very well be building these servers for high double digits. (Although I'd be more inclined to guess around $200, if they're actually buying the parts.)

If they're not just reusing old online.net gear, that is.