Support for some games in some countries want Government ID to confirm your identity/minimize the work they need to do (People don’t necessarily want to send that in so by asking for it they can dead end requests. Plus, not everyone uses a real name when creating accounts.). It’s possible Blizzard does this in one of the countries in question or is starting to do it overall.
Additionally, in cases of identity verification issues they will sometimes ask for it as well.
The reference to the Code of Conduct is likely because the Code of Conduct does not allow for discussions on punishment actions on forums. The good reason for doing this is because you frequently end up with people lying and claiming they were banned for nothing or because their little brother was on your account and you totally weren’t hacking. The bad reason is your systems for punishment don’t work or have a flaw that can be exploited that can lead to disproportional punishment.
Staff comments suggest that the allegations that the system can be exploited are false.
On the flip side, certain groups of players appear to have been actioned under other categories with a high degree of frequency and had appeals denied.