I can see the justification for this in Android's early life. Every Android phone having its own app store would have been a disaster for everyone: users, developers, Google, and even telcos in the long run.
Hard to believe, but Google Play (nee Android Market) was pretty damn shabby until about 2013 or so.
Hard to believe, but Google Play (nee Android Market) was pretty damn shabby until about 2013 or so.