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And the office could be rented. I think it is clear that Google expect people to check emails and do 'work stuff', it was mentioned several times.

If you worked on a personal project on a Google bus (on your own laptop, without using their wifi), would Google be able to claim ownership?

In California, Google's employment contract already covers that explicitly.

And they do claim ownership?

Yes. But the location or equipment aren't relevant.

They can often claim ownership of personal work you do at your own home. So yes.

Which is why I don't work for Google.