That's not a monopoly, that's their business model. No one is required to use eBay. You need to to be more careful when using terms like monopoly and making charges of abuse.
No one is "required" to use Windows however Microsoft is still a convicted monopolist. Ebay are certainly using their market leader position to lock out competitors in the payment system arena. Anyway, I didn't make the claim that they're a monopoly (the parent poster did that) and personally I'm on the fence whether they should or should not be considered one. You need to more careful when accusing me of making such allegations :-P
