Well it's Australia, this is just one more drop in an ocean of anti-youth policy...

Basically no.

Well kind of. They use the same data center infrastructure, with internal versions of the external GCP services.

Depends on the service but for the most part googles infra has its own stack that GCP is built on top of. There is always initiatives going on to get more internal stuff running on GCP as opposed to the internal infra directly, but none of them have really stuck that I saw.

If the engines are direct injected rather than port injected, they can just delay fuel injection until the intake valve is closed, and no fuel should be pushed back into the intake manifold.

I have read that modern Toyota engines use both port and direct injection, but am not sure what the Prius does.

You want both to keep the intake valves clean, yes?