I think you also asked something along the lines of "who would pay for Facebook".. the funny thing is that maybe you're right and not enough people would. However, people pay a lot of money so their phone can access data apps like Facebook (or Strava or whatever). I think if most divide their monthly data/wifi costs by the number of apps they really use, it's a lot lot more than the apps themselves cost -- even if they're subscription based and not purchased outright..