It's not something like Mesa. It's open source in the same way chromium or android is open source. A single company is the major contributor and decides the architecture and direction the whole ecosystem will go.
> Credentials never leak into the sandbox filesystem; they are injected as environment variables at runtime.
If anyone from the team is reading - you should copy surrogate credentials approach from here to secure the credentials further: https://github.com/airutorg/airut/blob/main/doc/network-sand...
Alternatively where is needs an API key, it should be one bound to the endpoint using it. E.g. a ticket granting ticket is used to create a bound ticket.
A copy on write filesystem would be an interesting way to sandbox writes, but there is difficulty in checking the diff.