The word, “Cheating,” without a clear definition within a given context, tells us very little. It’s an empty variable, like X or Y.
Also, just so we’re clear, what you, personally, feel is cheating doesn’t matter. You don’t make the rules.
Too difficult for you to understand? Rocket science?
Well, for everyone’s sake, let’s start by quoting the whole definition in the CoC:
Cheating
You are responsible for how you and your account are represented in the game world. Cheating in any fashion will result in immediate action. Using third-party programs to automate any facet of the game, exploiting bugs, or engaging in any activity that grants an unfair advantage is considered cheating.
Exploiting other players is an equally serious offense. Scamming, account sharing, win-trading, and anything else that may degrade the gaming experience for other players will receive harsh penalties.
The first thing of note is how incredibly vague this clause is. Outside of automation, exploiting bugs, and game hacking, what they consider to be “Cheating” is unclear.
This statement here, in particular, is quite open to interpretation: “Any activity that grants an unfair advantage…” By the very looseness of that definition, even gearing up could be considered as “Cheating.” Honestly, I suspect that what they mean by this statement is, “Any activity (implicit: that not all players can do) that grants an unfair advantage…” would be considered “Cheating.”
The reason premades and syncing remain (relatively) untouched is because, technically speaking, they’re not breaking any rules - as much as you may not like it. There is nothing stopping you from joining a Premade of your own; as such, it’s an “Advantage” you choose not to partake of. Secondly, I really do think that Blizzard is very reluctant to punish people for the mere fact of playing together and forming lively, active communities in an MMO.
I’ve heard that this has happened on occasion; however, I must reserve my judgement on the matter, seeing as there is a lot bias in these forums directed against such Premade leaders and their respective communities. I will need to take these characterizations with a grain of salt. As much as you may not like it, it is not against the rules to report people for AFKing, or even sabotaging a game, IIRC. Did they abuse the function? Hard to say… seeing as I wasn’t there.
At the end of the day, we’re not talking about the (purported) behaviour of Premade leaders and their communities. This is just an example of “What about-ism.”