Not quite sure I follow that logic. The point is an iphone can be configured to use a VPN (operated by anybody, not limited to Apple) without requiring the use of apps.
> The point is an iphone can be configured to use a VPN (operated by anybody, not limited to Apple) without requiring the use of apps
A very specific type of VPN, which is easily blocked.
I don't know if it's monopolistic as the comment you replied to says, but in the context of the thread, the build-in support doesn't fix the problem banning apps from the app store creates.