I was not aware of this until today. People use work profiles on Android to isolate their more privacy invasive apps. If you want those apps to be tunnelled through a VPN, you would have to install the VPN application you use on your work profile separately and turn it on separately in your work profile.
The VPN sharing choice is at least logical. You have to make a decision when designing a system how your energy the network stack. And if you say every profile and every user gets equal access to the network stack. Then you get this result.
But the feature of sharing VPN access is also useful. So it really just depends on what choice you made earlier. I don’t think this is necessarily evil.