80% of the US population is urbanized. Most of the ones that aren't still have access to DSL, cable modems, or fixed wireless of at least a few megabits.
Of the remaining population, a lot of them don't want to play video games or can't afford them anyway. Some (probably large) portion of those that are viable gaming customers will simply make do with satellite connections.
The "poor schmuck in rural Nebraska with 25kb/s" market segment is just too small to economically justify catering to.