AmazonBasics isn't any more trustworthy than any of the junk you find on AliExpress or at Wal-Mart/Target/Best Buy. (Except that it has a good return policy backing it, I think)
Amazon is at least liable (theoretically, at least) if they sell an AmazonBasics product that winds up giving my kids lead poisoning, and will have a lot harder time disappearing into the wind to avoid a lawsuit. They disclaim any liability for third-party sellers.
Unless Amazon is currently testing products for lead before recommending them, which somehow I doubt, then the potential of a lawsuit against Amazon isn't actually protecting your child.