Amazon Appstore on Windows 11 is still limited to beta users only. This app store is for Windows users to download Android apps from authentic sources and run them on computers. It is also part of the Windows Subsystem for Android ecosystem.
So far the Amazon Appstore is open to selected Android application developers only. Recently, it has been opened to all developers. Amazon has partnered with Microsoft to encourage more developers to publish their apps to the Amazon Appstore.
Amazon also gave examples such as Adible, TikTok, Lords Mobile, Hungry Shark Evolution, Epic Seven and several others that have successfully accepted new users for offering applications on Windows 11 without having to develop native applications.
Amazon also states that adding apps to their app store can help developers generate additional revenue. Anyway for now Windows Subsystem for Android is still limited to be tested by selected users. Users in Malaysia, for example, need to use the Subsystem for Android sideloading method and the APK file manually.