Incredible post. His sister is at university, her dissertation is in Google Docs - all locked out.
@jackyan I use Proton and can't recall ever having issues with it being flagged as suspicious, though I haven't ever used it for business or banking.
I also find it weird that their accounts weren't all flagged at once, if I read it correctly, but gradually. Granted I luckily haven't had to deal with this type of issue before (I've been locked out of accounts of course but not for this reason and have never setup my accounts like the OOP).
Its not impossible OOP's story is true but they got some elements wrong or lied about some parts which were embarrassing (or the kid lied about some aspects of what happened).