In addition to the third-party installation capability mentioned by siblings, Japan also has a regional capability for reassigning the side button to a third-party voice assistant (`com.apple.developer.side-button-access.allow`).
All other versions only allow denying mobile data to an app, not Wifi.
I really wish there was a way to enable this feature.
> I also found out the Chinese version has the ability to block an app for accessing both mobile data and Wifi/WLAN data.
Yet Apple is choosing not to enable it for everyone. It seems like it would be an easy and obvious privacy win, no?