It's rumores ebay is gonna to start accepting crypto payments. Have u heard? I am glad that more e-commerce companies are starting to allow the use of cryptocurrency to pay. It can be assumed that Amazon and Ebay will develop their own cryptocurrency
If cryptocurrencies become an affordable means of payment for trading, then this will also be a good opportunity to combine earnings from the sale of goods with investments. After all, you can use coins for trading and increase your free profits.
But then the company has to still go after trading which is I believe a big part of the profit you were saying. Plus the fees you have to pay in order to send that payment is somewhat not very appealing unlike fiats which you can pay without those fees.