because then Lego's lawyers would be sueing the everloving shit out of GSG.
Lego spends more money on its legal division than on R&D for new models, let that sink in. :/
there's a German YouTube, held der Steine, who is pretty popular and he is almost constantly in a fight with Lego. I loved Lego as a kid, but I learned that they're not the cop company anymore that I thought it was, sadly.