Bestworld
MBA
"It happened before" does not mean people are keen to expose it now. In fact, cheating/hacks have become much more widespread since MoP, then got worse in WoD. Many have given up on it and simply joined them or try to play around it. I can tell you personally of many people I knew from Rated bracket that have quit, and some that only raided but saw hacks increasing there too. like rotation bots. Just left because WoW is such a cesspool now. If you think it isn't in twinks or other areas of the game then you're ill-informed.
Rated and endgame PvP participation is down to about half of 1st season MoP levels, which is atrocious. It's caused the ladders to collapse. A large part of that is due to the cheaters. The end result is you have a far greater amount of cheats staying with fewer legit players around. That's one reason why you don't see as much reporting of this as you have before.
I am well aware of the hacks at endgame. Faced my fair share of kick bots, meld bots, bear bots, occasional fly hack etc. However, that is a different aspect, because of how incredibly large the bracket is at endgame. It's completely different to that of twinks. Unless the hacker is someone with a different name every time, trolling around, then it is easy to expose a continuous hacker, who goes by the same name and class. Phron in this case. Because people will simply band together and backup your claims. Because everyone knows everyone, and everyone (at least most) likes fair games.
Even at endgame people know who the hackers are. Look at Grappling, lol.