Zerotier.com did this years ago and it works great.
(I prefer device-based zerotier-style access rather than login-based tailscale-style so that does sway me to zerotier...but I have to admit tailscale looks more polished, e.g. the screenshot of seeing other devices on the network. I get it's not a fundamental feature! But I can't help but appreciate it)
The pulldown showing other devices on a network does look spiffy but that wont scale. We have users with thousands of devices on a virtual LAN and the protocol will scale far larger. Not only will that not fit in a menu but any system that relies on a master list will fall down. That list and refreshing it will get huge.
We are doing the tech first, spiff second.
I think the website could do a better job showcasing how it's used.
Hope my feedback is helpful and wish all the best!
It's kind of hard to explain ZeroTier sometimes. Its so simple (to the user) people have a hard time getting it.
"You just make a network and connect stuff." Huh?
People have been conditioned to think networking is hard because 90% of networking software is crap.
You make networks, add stuff to them, and any protocol you want just works: games, ssh, sftp, http, drive mounts (though they can be slow over the Internet), video chat, VoIP, even stuff like BGP or old protocols like IPX work.