The first rival Android app store just arrived in the US Play Store.

However, until now they’ve only been available if pre-installed on a device – as with the Amazon Appstore on Fire tablets or Samsung’s Galaxy Store – or installed via sideloading. Google appears to have prepared a dedicated section for third-party app stores within Google Play, and Aptoide is just the first. . Listing rival storefronts within the Play Store makes them much easier for …
Read the full story at The Verge.
Third-party app stores have always been available on Android, which is a more open platform than iOS in that respect.