[rammer]

Casa approval is a necessary step, we have gone through that for one of our apps approval that requires Google drive write access.

Yes you are essentially asking users to give a whole lot of information because giving access to Google drive technically also gives access to a lot of the Gmail attachments because people tend to save them in Google drive.

You can't fault Google with being trying to be too careful. If you think this was painful try accessing the shopify marketplace.