What part of Lend Lease was America stealing from Britain? It was a mutually-beneficial trade and technology deal that ensured the British Empire stayed in the war thanks to American materiel in exchange for technology and personnel (Manhattan Project, penicillin industry, proto-computing, engineering innovation, etc.) built on the solid cultural foundation both nations shared. Meanwhile China has managed to alienate every trade partner it's struck a deal with, surrounded by neighbours more than happy to cut ties as soon as they move beyond post-industrialisation, and share no cultural foundation with anybody aside from Mandarin enclaves in Western nations that continue to grow as the rich-poor divide in China widens and the poor increasingly look towards prosperity outside the Middle Kingdom.
Trying to imply Germany stole from Britain is as laughable as it is a grave insult to the industrial heritage of Germany post-unification. Like the Americans, Britain had strong ties to Germany (instead through royal bloodlines and immigration) but German industry grew from a deprivation of colonial resources that the German Empire lacked (ironically due to the Brits and French cockblocking them). How could German plagiarism explain the extraordinary recovery of the Weimar economy in the late 1920s? Answer: it doesn't, because the Germans would laugh in your face if you tried to imply to them that they always stole from Britain.