No it's not. Like moving from Instagram to something else, that's going to be very tough because nobody else is on there. Same with WhatsApp.
In this case it really is easy. It's just wireguard with some NAT negotiation sauce and convenient auth layer.
You're doing the Dropbox rsync comment.
To be fair, only the mesh part of the problem is quadratic. Reliable hole punching is not that easy either. As far as I know, there is a level of circumvention in case the unwrapped WG is blocked too.
The integrated service is very valuable and obviously genuinely popular.