There are plenty of alternatives out there. I built https://shellbox.dev, which gives you instant vms via ssh where unlike exe you pay only for what you use-- scale to zero. It is also regular linux, supporting vscode and zed remote, Nested virtualization, etc.
If you're looking to invest im fine with only $5M :)
Neat service. Website doesn't provide enough information for me to trust any workloads to it. Not clear where the underlying infrastructure is, what security guarantees I get, etc.
The other day I vibed a very stable codeserver (vscode in browser) instance with zellij browser mode (console in browser), syncthing (filesyncing), ssh, pi agent and wireguard. No exposed ports, every web frontend is password secured.
I don't want to make that public, it's my way of an isolated dev environment and it runs on my private raspberry behind my tv. Costs me nothing.
I hope you have a good success with your service.