[sciurus]

I think with the App Engine Standard generation 2 runtimes you don't have to write to their sandbox anymore. It still has to be one of their supported languages though, instead of any arbitrary server.

https://cloud.google.com/blog/products/gcp/introducing-app-e...

[thesandlord]

Serverless Container support is coming to GCP: https://services.google.com/fb/forms/serverlesscontainers/

[chrisbroadfoot]

Very easy to exec() into an arbitrary binary from these 2nd generation runtimes.

(and, as thesandlord notes below, arbitrary containers is the idea behind g.co/serverlesscontainers)

Disclaimer: I work on GCP.