Verbal offer is worth the paper it's written on.
A verbal agreement from an honest businessperson can be as good as gold. And when someone reneges on a verbal agreement it's generally a clue that they wouldn't be great to work with.
But this is surprising from Google. Most likely a one-off mistake
I agree with you there, but I would never trust my ability to judge whether a businessperson is honest enough to take that leap of faith. Also, Google is notorious for making unforced errors in their hiring process.
https://www.tonybeshara.com/tips/accepting-an-offer-new-empl...