Not a fair comparison IMHO - Ethernet is designed to be a connection between two or more otherwise independent peers (on L2), while USB’s goal was to allow connecting simple peripheral devices to computers. There was never meant to be a situation where it’s unclear which side is the Host.
Also note that the bridging “cable” is literally just two USB devices, one for each computer (although they are both on the same chip, so there’s that), with some internal link to pass the data.