With enough users on the network, wouldn't you be able to fairly easily extend the range by using idle beartooths as relay devices / amplifiers? Similar to how packets travel through the Internet.
That's not at all similar to how packets travel through the internet. Mesh networking is a very complex arena that deals with many issues that don't have known good solutions.
Not sure if it's true for this configuration, but I know for GoTenna (a competing product), the terms of use of the unlicensed frequency bands forbid message relay.