Earlier quoted context omitted.
For anyone else that was curious, zerotier appears to be a virtual network tool, kind of like Hamachi but not run by a terrible company and with a much saner pricing scale.
It looks great, is open-source, and free for up to 10 devices. I've been using Hamachi, but I may switch.
from an email earlier this week:
"For new subscribers we've increased the price to $29.00/month (USD), but we've also increased the maximum number of devices for free accounts to 100.
We think this better reflects the difference between personal and business users, providing plenty of devices in our free version and charging enough for our business customers to justify adding new features and services and to support the continued development of the entire ZeroTier ecosystem."