Game center

If you do not want to use Game Center, do this:

Go to

Settings -> Game Center -> Scroll to the bottom and select Sign Out.

After, go to:

Settings -> Apple ID (Your Name) -> iCloud.

Find the Game Center in the list and turn it off if it is not already.

I've turned it off in iCloud long ago already, and how often I sign out, I keep finding myself signed in. I don't want it, but apperently Apple thinks I should have it, so then what can you do?

Apparently, no.