You can share any terminal that way then, with anyone's weird setup, vim or not.
I haven't been able to find it or emulate it. It would be great but each user is sharing the same instance of Vim and sharing their shell (well, in Pairing mode, at least).
... I forget people use vim to do anything but programming?
Switching control ("we can do it this way, let me show you") also has less friction with collaborative editing tools compared to classic in person pair programming (no need to shuttle a keyboard/chair back and forth).
When I started using Screenhero which allows screen sharing with multiple cursors it was incredible how effective it felt.
I can see how it would work really well for authors to an extent