If it is indeed abuse related (whether there was any abuse or Google's algorithm just decided there was some abuse) then telling the abuser what got them banned is counterproductive from Google's PoV. Same reason reddit does vote fudging.
This is a dangerous equivocation of the guilty with the innocent, and throws away completely the notion of "Better X Guilty Persons Escape than that One Innocent Suffer."
Do schools or parents not teach philosophy or ethics to these FAANG employees?
Telling people what they did wrong so they can correct it is appropriate. You don't have to tell them how you detected it, and keeping them banned until they fix it is fine.
Also at minimum I'd think I'd allow them access to past emails as a default.
And if it's not abuse related a Google employee could just take a
look at it and lift the automated ban if it was unwarranted. Too
bad Google doesn't like having employees for anything that an AI
can do with 50% success rate.
