I think it would be possible, but it's not what VNC is usually used for.
Furthermore, it's usually set-up so a login is required that is obvious to the end user.
The type of network it's used on in this context, is irrelevant.
Samsung Galaxy S9 review
Wacom Cintiq Pro 24 and 32 review – hands-on
When is the next Apple event?
Qu’est-ce qu’Amazon Prime ?