You are fortunate to be in one of the few areas where there is true ISP competition. For most of the country there is none. Yes, it may be hard to move off of gmail but it isn’t impossible unlike changing high speed internet providers for most of the country. You can leave Facebook and communicate in other ways. I’m sure your aunts and uncles have phones so you could text or call them.

I don’t see how splitting up Apple or Google would increase the number of mobile OSs. There have been companies in the past that have tried building a mobile OS either for a specific phone or as an open source OS and none of them have really gained traction. There have been rumors for a couple years now of some of the phone manufacturers talking about building their own OS to use in place of android, yet those still haven’t appeared. Microsoft failed at mobile because they were too late to the party, people already knew which mobile experience they preferred.