Generally no. They have internal controls where only certain employees can access user data and they probably have to give a reason and get approval from a second person.
If I understand correctly... Not all the time but they can ask permission from friends if they cant?
No. 99% of Google employees probably can never see your data. There are specific departments where people can see your data but they should get fired if they do it without a good reason.
They do. I saw it happen.
If both work in the right department and don’t mind leaving an audit trail, I guess?