Right now superstimul.us is hosted on a Vultr VPS instance. I use Vultr because it's a decently reliable VPS host that offers OpenBSD (though this instance is running in Docker on a Debian system). Much cheaper than AWS; comparable pricing and features with many other VPS providers.

But I just went looking at the prices of competitors, and Hetzner is cheap. How is it so cheap? For roughly the same price I'm paying for this host, I could get ~8x the vCPUs and RAM, and 4x the storage.

It would be a hassle to migrate at this point, but I'm definitely tempted.