I mean, the only way to test this is to require of Google here to release the source code. And then look at how a court will evaluate it. For instance, what if Google never sends the source code? What if they claim that no request made it in? Though I guess this can be ensured, e. g. via letter that is registered being sent and then looking at Google's response to it.

So right now I think we all probably do not know. Google MIGHT refuse to release the source code, but it could release it - we don't know yet. Someone has to test that.

GPL not defining a time limit to comply also doesn't mean there isn't a reasonable limit on compliance time. Google is more than capable of quickly complying. It comes down to whether a judge would think what they're doing is reasonable and we don't think they would.

The software also isn't in the preferred form for modification. The build system which runs Git commands and doesn't work as intended without it. You have to make a Git repository for it to work and there's meant to be a separate one for each separate component. It spews out errors.

But google already built a tool to do exactly that: https://github.com/google/copybara