There is one Stack Exchange site, Unix & Linux, where every question on any Unix-like operating system, including Linux, is welcome. So why a separate site, Ask Ubuntu?
Ubuntu is based on Linux and the questions there are on topic on Unix & Linux. Also there is another Stack Exchange site on Android. But Android is also a Linux as well. So why these three sites? Questions on Ask Ubuntu and Android Enthusiasts are perfectly on topic for Unix & Linux. Shouldn't they be merged with the Unix & Linux Stack Exchange site?