So my understanding is, what Mullvad is to VPNs, and what Tarsnap is to S3 (kinda), Servury is to entire VMs. It's a prepaid model, you get an account identifier, and that's basically it.

This is very cool. I have wondered for a very long time why such a site does not exist. What pops to mind is that you could get better unit economics reselling really small VMs to the privacy obsessed. I know some netizens who would pay a dollar a month for, say, a tiny NetBSD VM and 64 MB of RAM to serve their tiny static demoscene website of yore. There are some real wizards of there.

Not sure if that's in your roadmap but definitely something to consider in this space.