I don't know if they can "just" dump the key from RAM on a bare metal server. Nevertheless, it covers my ass when they retire the server after I used it.

And yeah I've had quite a few servers die on me (usually the hard drive). At this point I'm wondering if it isn't scheduled obsolescence to force you into buying their new hardware every now and then. Regardless, I'm slowly moving off scaleway as their support is now mediocre in these cases, and their cheapest servers don't support console access anymore, which means you're bound to using their distro.