eBay and Amazon insulate themselves from product liability using the legal principal of "caveat emptor", meaning "buyer beware". It basically says that it is incumbent on the BUYER to understand the requirements for the products they purchase and to make sure the products they buy meet those requirements. It's really BS though because a brick-and-mortar store has to worry about being sued, because they BUY and resell it. With Amazon and eBay, they are transacting it, but they don't buy and resell most of this kind of crap, so they will use their lawyer power to stay out of any lawsuits. then because the makers of this crap are in China, there is no way for a US consumer to go after them if their house burns down.