Everything is proprietary to some extent, all big box stores have their own internal brands, and exclusivity deals for certain brands and products.
Should Walmart start selling Costco brands and vice versa?
Neither Google nor Apple allow apps that circumvent their own app stores on their markets.
With ApplePay there is very little chance that you&#x27;ll have any other competing payment service (e.g. Google Pay, or PayPal if they&#x27;ll want to go through the NFC route) that won&#x27;t be using Wallet&#x2F;ApplePay.
If we are completely fair Google&#x27;s policy towards Amazon came kinda first, Google doesn&#x27;t allow the play store and services to be installed on devices which have their own app market app, this is the reason why Amazon&#x27;s android Kindles didn&#x27;t come with the play store (and before some one mentioned Galaxy Apps, Samsung doesn&#x27;t charge money so it doesn&#x27;t violates Google&#x27;s policies).