I lately seen a lot of clash of clans and other games topics here. Should they be related to our topic of apple? I see the games as universal across all platforms (like android) and should not be related purely to apple and they should use another site.
According to the help center
Ask Different is for users of Apple products. If you have a question about ...
- third-party hardware, services and software when associated for use with Apple products.
... then you're in the right place to ask your question!
so problems related to software running on Apple hardware are on-topic. Also a lot of these questions are related to the interaction between the game and Game Center which clearly is an Apple-related issues.
OTOH questions purely focusing on in-game issues are off-topic (but I haven't seen many of these here).