I know...there are smaller marketplaces that people can buy/sell goods via bitcoin, but why a major marketplace is not emerging??
I know for a fact, there is a huge demand for purchasing of goods with BTC...even users from this forum is enough to give the marketplace a supply chain issue

1. is the problem in supply side? are sellers worried taking payments via BTC bcas of volatility
2. is there a logistically inefficiency, that smaller sellers can never compete with the likes of amazon
3. is the transaction speed an issue for retail transactions?? major cards payments are done instantly (maybe this speed is needed for impulse purchases

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Comment below...thanks i'm a newbie here

Think of this from Amazon's perspective.Almost all their buyers use debit/credit cards.Implementing cryptocurrency payments won't boost their overall sales and probably 3-5% of all their customers will use crypto coins to buy stuff.Is it worth it to implement cryptocurrency payment gateways?I don't think so.
Plus,cryptocurrency prices are very volatile,thus Amazon will have to convert all crypto to fiat as fast as possible.Therefore adopting crypto payments is kinda pointless,from Amazon's point of view.