> Google's smart enough to know not to explicitly block a competitor, they just make it impossible for the competitor to participate. (For instance, requiring Play Books be installed to get the Play Store guarantees Amazon can't ever sign up to get Google Apps on the Kindle.)
They could, as Barnes and Noble proved when they went full Google Android from their forked version with the Nook; they won't want to for the same reason B&N didn't want to until it had proven it couldn't get anywhere with it's forked version, since it would be opening up Amazon's walled garden and letting Google's competing market in.
Similarly with cart/payment integration: those don't make it impossible for Amazon to integrate. They just make it undesirable for Amazon since that's Amazon's central value proposition to third-party vendors, and Amazon has no desire to strengthen the appeal of any other platform that offers that for customers and, thereby, other vendors.
Amazon isn't going to stay off because they are blocked (whether directly or indirectly), they are going to stay off because they need it to fail, because it is a replacement for Amazon's already-dominant marketplace, and any gains it makes with consumers and third-party vendors are at Amazon's expense.
They could, as Barnes and Noble proved when they went full Google Android from their forked version with the Nook; they won't want to for the same reason B&N didn't want to until it had proven it couldn't get anywhere with it's forked version, since it would be opening up Amazon's walled garden and letting Google's competing market in.
Similarly with cart/payment integration: those don't make it impossible for Amazon to integrate. They just make it undesirable for Amazon since that's Amazon's central value proposition to third-party vendors, and Amazon has no desire to strengthen the appeal of any other platform that offers that for customers and, thereby, other vendors.
Amazon isn't going to stay off because they are blocked (whether directly or indirectly), they are going to stay off because they need it to fail, because it is a replacement for Amazon's already-dominant marketplace, and any gains it makes with consumers and third-party vendors are at Amazon's expense.