If I share my wifi with a neighbor, I trust they aren't abusing that and are being respectful to not waste my bandwidth, for example.

WIth Tollgate-OS that lets me put a (minimal) price on that bandwidth, and if they want to stream video 24x7, they can -- they just would have to pay more for doing that. They can even run a Tollgate-OS router and re-sell my bandwidth to their neighbors, and earn a little profit themselves. And their neighbors can do the same (though, each additional hop increases latency, so there are limits).

I don't know meshnets well, but I presume they strive to ensure optimal routing and are fault tolerant where, if one path slows, or goes down, your traffic continues through another path.

I don't know Tollgate's roadmap for that specifically but the software choosing which upstream Tollgate node to automatically purchase from next, based on cost, is something planned.