What is the market penetration through other stores compared to the pre-installed Play store? - 1:10, more? The total control of Apple is an obvious problem but

What is the market penetration through other stores compared to the pre-installed Play store? - 1:10, more? The total control of Apple is an obvious problem but in practice, dominance despite an 'open market' can be just as problematic. I do believe that success breeds responsibility.