Amazon is opening up its mobile app to rival retailers, but it's definitely not out of the goodness of its heart. According to The Information, the e-commerce website will launch a "place cards" service that its competitors can use for newsletters and the like. It's part of an even bigger undertaking called Amazon Commerce Services. When you click on a link in the place card, you'll be taken to a page that looks like the store's app or website but is actually part of Amazon's app. Apparently, the e-retail giant is hoping that the companies it manages to entice will end up using its other services as well, particularly Amazon Payments. Since the company takes a cut out of every transaction made through the payment solution, it could become a lucrative venture if it ever takes off.