What exactly does Amazon offer today that sites like walmart, ebay, target, etc don't? Maybe amazon 8 years ago was better, but today the gap is nonexistent. w

What exactly does Amazon offer today that sites like walmart, ebay, target, etc don't? Maybe amazon 8 years ago was better, but today the gap is nonexistent. walmart's checkout process and delivery/order history experience is silky, i was totally surprised by it when i started using them a few months ago.