When you work for most public corporations, you aren't allowed to bring personal devices linked to company servers to specific countries. You need to bring a burner device instead, because you are perceived as a target for corporate espionage.
This is like that, except the government and the type of people on the list are even better targets for their personal devices. The government has strict rules about secrecy and communication for military operations, and strong punishments for not following these protocols, because they can lead to a loss of life.
This is a different sort of "unsecure". The platform itself may be "secure", but the device, being in public where someone could take a picture of military secrets, etc. isn't.
It's called BYOD. Corporations have flirted with it for 10-15 years. The C-suite far too often is allowed privileges and exceptions like aristocracy that sacrifice and weaken the security of the organization.
Also, even for corporate-managed devices, as an example, Meta has specific requirements and procedures for taking devices to and returning them from contentious places like mainland China.
This is like that, except the government and the type of people on the list are even better targets for their personal devices. The government has strict rules about secrecy and communication for military operations, and strong punishments for not following these protocols, because they can lead to a loss of life.
This is a different sort of "unsecure". The platform itself may be "secure", but the device, being in public where someone could take a picture of military secrets, etc. isn't.