Dropshipping to Amazon Question

Hey guys,

I'm not sure if people dropship on amazon. I'm not talking about using amazon as a dropship source or using fba, I'm talking about dropshipping directly on amazon. I'm sure there's a good reason as to why most people don't dropship on amazon like they do on ebay such as shipping times and other things. If there is any other reason about why most people don't dropship on amazon I'd love to hear them or maybe a lot of people still do it's just that I've seen barely any threads or tutorials about dropshipping on amazon.

Thanks