Ask HN: Running Untrusted Code as a Service?

A previous discussion about this use case here: https://news.ycombinator.com/item?id=32317520

Firecracker[0] always turns up in these discussions.

Also check Kata containers[1]

0 - https://aws.amazon.com/blogs/aws/firecracker-lightweight-vir...

Why not to use virtual machines for this?

The untrusted code might try to access the host machine. Or run an endless loop, or fill the disk. I think OP is looking for a service that would deal with these edge cases (timeouts, resource limits, extra security layers).