Psychologically speaking, we (boxers) are a group that thrives on our ability to pay for an advantage. In the market of what you can pay out of game to improve yourself ingame, watching the first step of the supply getting shut down is going to get people on edge. Today, its pay for use add-ons (which I would hope have a significant quality above free ones). Tomorrow, they start listing boxing software as a bannable application.
Is it likely to happen? Not in the slightest, but it's the reaction that the first event evokes that is riling everyone's feathers. There is a shift in policy at Blizzard, and such things naturally make people nervous, wondering if something they do or use is on the chopping block.