The openness of Android is the thing that kept me on the platform. Now that the openness is being removed, iOS is now more appealing.

Sadly, I think most of the customers that use Android never sideload a single app at all. I don’t expect this to create a mass exodus, but a smaller one with power users.

This will only be effective so long because gradually apps will require greater and greater API levels. Staying stuck in the past is, at best, a temporary solution.

If those other sources make more money and get more viewers, why did it start on YouTube?

$$$ that’s why. YouTube gives the greatest return. If they post to multiple platforms, not only is it more work, but they then also subtract from the number of views they get on YouTube. It’s all about the $$$.