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I think they get off in grey zone technicalities by providing the addon free of charge, while charging you for the guide that actually gets loaded by the addon. I doubt you'd be in breach of ToU by buying, but they'd possibly be in breach by selling. So long as the addon doesn't disrupt the game, you will most likely not be actioned. Remember, Blizzard always reserves the right to block any and all addons they do not like.
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"This is the fifteen-thousandth four hundredth and ninety-eighth occurence".
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