None of the links show except for AJ. :B
Hathorcat is right, they use the ebay-pictures to show you what they CAN do. They do the same with i.e. japanese Lolita-dresses or L.V.designer handbags all the time.
The law is as following: As long as they produce IN china FOR the chinese market, this is perfectly legal actually. The rest of the world and especially us designers frown upon it but there's not much you can do about it. ( not even Hasbro afaik! D: )
BUT once they start selling to or for the international market (via ebay, or offering to international retailers) the legal copyright-holder can sue them.
Nevertheless, I really really hope that Hasbro will one day see the opportunity of releasing cute, show accurate plushes.
(I personally would already be happy if the rest of the main6 would exist in the TRU-jumbo-plush-style. My TS and Pinkie look so lonely. :B)