Gamecenter's Guerilla tactics will drive iOS users away from the platform... Necessary casualties for Apples invasive Marketing Department!
Whilst, my first suggestion had worked for a few days, the Apple insurgents forced me to find an alternate way. I figured there must be a way of deleting my account (or as suggested my Apple's T's and C's of being banned). So I launched Game Centre from Settings, and after 5 minutes of the Apple spinning whelel of incompetence let me in, signed back in. No setting to switch off there.
However, Apple required me to agree to their Terms and Conditions... and included a Disagree button, I declined Apples T's and C's for Game Centre.
On the next Game play, the Game Centre pop up, popped up... The game clock does not pause so effectively spoiling yet another game (Thanks Apple!) - this time I did sign in as me... I figured having disagreed to Apples Terms I should not be allowed in. Allow enough time for the Apple spinning wheel of incompetence (maybe Windows is not such a bad platform after all) to finish and I was reverted back to the log-in screen again. Click Cancel to get back to that spoilt game as you can't complete the level In time.
Upon the next game play (closing the game and re-open) no pop up! This is only day 2, so truly hope I've not spoken too early... But I am keeping fingers crossed, as clearly common sense eludes Apple HQ to allow iOS users a Disable button.