I'm pretty sure I can build a tinder clone with cool extra features pretty easily - barring maybe the infrastructure to support a giant number of users and the legal issues of operating internationally. But such an app would be completely useless, since the point of the app is that their userbase can easily be half the dating pool of your city. The same idea is true for many internet businesses - once established they're almost untouchable. they can't be challenged unless they screw up royally or someone's able to launch a giant enough marketing campaing that can bootstrap a large userbase in a matter of days.
Join to that the tendency towards monolithic ecosystems (google, apple, to a lesser extent microsoft, huawei...) and the result is pretty scary.