I understand. I prefer to minimize risk, though, so I don't use services like Uber/Lyft, and I stopped using Amazon and eBay entirely.

Interestingly, I stopped using eBay precisely because they left me stuck with a fraudulent charge. The process of trying to dispute it using their system was so drawn out, though, that by the time eBay told me to go pound sand, it was too late to do a chargeback. But even so, I'm certainly not willing to risk trusting them again.

Amazon would be the one with the most competitors. Many Amazon sellers have their own websites, not to mention Aliexpress, Walmart, Target, HomeDepot, Bestbuy, Monoprice, Staples, Costco, etc.

I'm referring to competitors of the overall Amazon experience, not really the individual products, in which the main value proposition for me is the extremely fast shipping. Those other stores typically don't offer it at a reasonable price, because they don't have warehouses a stone's throw from most customers.