[jjwhitaker]

It makes a lot of sense and I have several friends who use similar services. But if Tethering disables wifi (at least connecting to wifi as your phone is now acting as a router) then their hybrid component breaks and only uses cell which may be throttled, limited, or not available. It sounds like more a CYA against higher bills from whoever they are renting service from while keeping their Hybrid setup functional for better service. I'd be frustrated if my budget plan had terrible service when tethering because 80% of my traffic is normally over wifi and works fine but now is being funneled 100% into cellular.