I'm confused by this. Amazon's not an "e-commerce platform"; it's a store that's half Walmart and half flea-market. Shopify is an "e-commerce platform" to me. Which of these is FedEx intending to be?
Amazon is a mediocre storefront on top of a high performance logistics company. FedEx already has much of the logistics and it wouldn’t take much to compete with Amazon on the storefront side because the experience is so bad.