If Mircrosoft and paypal accepted bitcoin, why not for Amazon, this could be the perfect mode of payment from their consumers, with no hassles and delays.
Amazon is responsible for far more sales volume than Microsoft will ever be capable of, and that's something people tend to ignore here. Bitcoin at this point isn't ready for such a large player, which could be the main reason why Amazon is holding off -- in order to take take away Bitcoin's limitations we need lightning network. If after lightning implementation Amazon still isn't accepting Bitcoin, then they just aren't interested. Realistically speaking, Amazon doesn't need Bitcoin or crypto to gain popularity and grow -- they have managed to grow significantly in the last few years to where they stand right now. Also, PayPal itself isn't accepting Bitcoin....