Its not as clear cut as that, I had a situation where the seller listed the item in a category that wasn't covered by paypals refund policy even though it was a physical item, relating to football. After requesting the refund on Paypal, by entering the transaction id, it just kep saying sorry the item is not covered.
And as for ebay, they did absolutely nothing, even though the item was not as described. I even lodged a complaint to say the seller is trying to circumvent the refund process deliberately, which is against the rules, which clearly held no water.
Anyway, after threatening the seller with a negative feedback that would damage what was a respectable feedback score I received a prompt refund. Once the funds were safely returned, I just as promptly left the negative feedback, he closed shortly after. No doubt setting up another account as we speak.