Sure, Android was released under open licenses and Yandex is free to use it. However, Play Store is not open source or released under an open license so if you

Sure, Android was released under open licenses and Yandex is free to use it. However, Play Store is not open source or released under an open license so if you want to use Android to spread your crapware you don't get to complain that Google doesn't want to license you their app store. They have no moral ground to stand on.