guidelines and rules are for wusses
activision is only going through the QA process to cover their ass like everyone else, so if you're computer blows up and you take them to court, they can say its your fault because they tested it flawlessly.
along those lines, its standard, since that americans like to sue for everything, thats why you cant hardly install something with clicking something which "says" that u read and agreed with the EULA. think about it.