> I've never run into any of the anticompetitive problems people claim are so damaging

That sounds like you either haven’t heard all of the indie developers complaining or are inclined to find reasons to say problems with “your side” have some other explanation. For example, this was just a couple weeks ago where Google’s “open platform” blocked a popular app from doing what their mutual customers wanted:

https://ia.net/topics/our-android-app-is-frozen-in-carbonite