The e-commerce industry is one of the fast growing markets, and every year the turnover of e-commerce grows. Emarketchain wants to solve some problems existing in this market, removing intermediaries in this market, manufacturers can directly sell their goods to consumers, while the price of goods is reduced which is very beneficial for consumers.
That's why Amazon is also one of the fastest growing companies. It feels like they are just a synonym for the whole e-commerce market by now. If they launch their own crypto it's going to be interesting.
I am working for one of the biggest online stores. Is not Amazon, is the other one

And i assume soon or later they will go in this direction by launching their own crypto but I doubt that they will remove the commissions. They are very greedy...
It depends on what kind of alternative technologies will be deleted and offered to the consumer. If there is a platform that works without commission, the big ones won't have much choice but eliminate their commission as well.