Google isn't been made in one day, Amazon isn't been made in one day. It takes lot of trust from the customers to become the best place.
There is no way that this platform could fight amazon and I don't think that they thought about it, amazon is a huge company. GILGAMESH will try to bring those authors and users that are involved in crypto world to their platform.
I agree, there is no need to compare amazon to gilgamesh, amazon is really popular now and only accepting fiat currencies while gilgamesh is in blockchain technology which is not supported by amazon now. So, let's just hope that gilgamesh project will achieve its goal and be successful in the coming months.