Stop calling for legal action. The addon policy isn't a court matter, it's Blizzard telling us how they are going to code their game.
1) Add-ons must be free of charge.
All add-ons must be distributed free of charge. Developers may not create "premium" versions of add-ons with additional for-pay features, charge money to download an add-on, charge for services related to the add-on, or otherwise require some form of monetary compensation to download or access an add-on.
That can certainly be challenged in court and should be. As can:
8) Blizzard Entertainment has the right to disable add-on functionality as it sees fit.
To maintain the integrity World of Warcraft and ensure the best possible gaming experience for our players, Blizzard Entertainment reserves the right to disable any add-on functionality within World of Warcraft at its sole discretion.
If the only reason for disabling said add-on is because the developer is requiring recompense.
Now, Blizzard could always simply end the argument by:
Removing the use of any and all add-ons from the game.
With a free cash flow of over $1B, Activision/Blizzard shouldn't be concerned about this. And neither should you because in a market, you pay the asking price or you don't depending on how much you value the product or service.