I'm sure the 20,000 network users around the world tried "the easy way" before investing considerable time and resources into developing "the better way."
Your half-duplex points literally do not apply to the librerouter. It has 2 separated 5Ghz radios and a separate 2.4 for local access.
Before you tell others how to build the network they already run, you might take 10 minutes to find out that they've managed to serve otherwise unconnected individuals and communities in remote parts of Argentina.
Sure, this isn't cutting edge tech, but it's cheap, scalable, and easy to upgrade. If you want to help these projects, you can find a 802.11ac chip with FOSS drivers. Until that happens, their hands our tied. Sorry not sorry.
In general, those ToS would likely be struck down under precedent. Additionally, it's bad news for an ISP to cut off their low-cost, ethical competition that will only help your cause. Source: I built the internet backbone for this: https://www.nycmesh.net/. If your city is on this list: https://en.wikipedia.org/wiki/Internet_exchange_point, you can buy data center internet like we did. It runs about $1,000/mo and can serve about as many people (by over-selling the bandwidth 20X as is standard in industry).