I have seen somewhere where someone asked if "blahblahblah something" addon was allowed and I think some people said that all addons on curse is legal and that if a addon were illegal blizzard would block the addon so that it wouldnt work in the game.
But when I were doing eye of the storm the timer said "5:00" so I said in chat "hey everyone, we win in 5 min!" and a few people asked how I knew that and I said it was some kind of addon that could show the time on how long time left till a team won and they said
"OMG cheater! im going to report you for cheating!"
But I told them that im not cheating, its only a legal addon but they kept saying stuff like "Reported, friggen cheater, I hate cheaters like you, ruin the game" and such.
So is it really cheating or were they only a bunch of trolls? I have seen alot of people using this addon so I think its legal.