The difference is that Amazon (unlike the other giants) doesn't have a moat. Facebook and Google basically have one product that is a money machine which funds

The difference is that Amazon (unlike the other giants) doesn't have a moat. Facebook and Google basically have one product that is a money machine which funds everything else. The rest is mostly window dressing. Amazon does not have the luxury of being able to rest. I think you will find a similar culture at Netflix, which is also in a competitive market.