The fact that on a website, where the app is being introduced, they have to place several links to various stores, in case of each of producers, locating them in different parts of the site, using different designs, makes the process of getting the app very chaotic and non-intuitive for users. Whereas it may indeed be right that each operating system has its own installation interface, in my opinion, there should be just one, central space with software, which is responsible for directing to a proper one, optionally, if using such an interface is not required, enabling to download the app directly from there.