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`).

I also found out the Chinese version has the ability to block an app for accessing both mobile data and Wifi/WLAN data.

All other versions only allow denying mobile data to an app, not Wifi.

I really wish there was a way to enable this feature.