When I buy something on Ebay I can choose which individual person/store I buy from - I can see reviews, their specific listing, etc. - even if I'm buying the ex

When I buy something on Ebay I can choose which individual person/store I buy from - I can see reviews, their specific listing, etc. - even if I'm buying the exact same product. With Uber I press a button and some driver shows up. I definitely think I'm dealing directly with Uber a lot more than I am with Ebay.