So there is not much of a proof, just a feeling. It was more about business rather than an "EULA violation".   
By the way the word "trade" was only recently added to the EULA. What is going on really ? Not to mention it is not directed to the license itself, rather to the program. Is it legal to do so ?   
Friend A buys module A and friend B buys module B. They decide to gift the modules each other. That is gifting still, how can you call it trading ? It is VERY very unclear, atleast to me, how this is being handled. Why not just say the truth rather than call on EULA violations ? (violations that weren't even violations before the recent EULA subtle modifications)   
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EULA is a legal contract, is it legal to edit it out of nowhere ?