Dr. Gebru was fired for having approached a lawyer about workplace issues. (She told Jeff Dean and others that she was doing so in an email made public). That triggers Legal to retaliate and look for a reason to fire the employee, immediately. Jeff Dean let the conflict drag out 6+ months because he thought he had control of the situation (and he was wrong). Without Jeff Dean’s persistence, Dr. Gebru would probably have been retaliated upon as swiftly as those in the Alphabet Workers Union. That’s how Legal and HR work—- they retaliate if litigation looks imminent. (Levandowski lasted so long because he was dealing with not Jeff Dean but Larry Page).
Google handled Dr Gebru’s exit differently than that of Anthony Levandowski, Andy Rubin, David Drummond, etc etc because Jeff Dean made the call in timing and he was really that clueless about public optics, especially with Tensorflow’s huge following. Moreover, Dr Gebru didn’t have the bankroll to fund a legal team like any of the others listed.
A lot of the posts here suggest Google is struggling with scale. Dr Gebru’s case definitely would have been handled differently were Google a smaller company. Also if there wasn’t COVID—- keep in mind she was fired a couple days before Thanksgiving during COVID. The whole country was a mess then.