Enabling searxng on a NixOS instance is trivial and works well. What are you missing here ?
NixOS
NixOS is a Linux distribution built on top of the Nix package manager. Its declarative configuration allows reliable system upgrades via several official channels of stability and size.
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It’s an interesting thought and I’ve thought before it would be nice if I could pay for an exit node but not be legally responsible or have to maintain it. I’d pay $10 for that. I think crypto miner is where you lost me. Big crypto fan, but mining on a VPS is a bad idea. You’ll consume a ton of resources and power and generate next to nothing in terms of coins.
I'm pretty ignorant on crypto, I just knew that it was important to have many mining to increase transaction times, decrease transactions costs, decentralize proof of work, etc. And practically you're right, might be a good way to absolutely ruin the performance of the server.