If a legit account owned sends a paypal gift from their normal pc/broswer/ip, there is no way to chargeback. The only way to chargeback the gift, is to prove that the real account owner did not send the gift payment (unauthorized aka fraud). Many scammers will use a stolen paypal account to send you the gift payment. This is how the gift chargeback always happens.
Not exactly. Sending as a Paypal "gift" doesn't exist anymore. Don't know why people refer to it still. Was thrown out a long while ago. It's now payment for a service or product/friends or family. No gifting option is there, meaning disputing options are available for both. For scammers, they always charge back though credit cards, claiming items weren't given to them in cases where tracking numbers are not there, and more commonly, as "unauthorized access" in which, according to Paypal, they'll refund you up to a certain amount. An unauthorized transaction can occur without switching browsers or IP's (theoretically), so Paypal pretty much grants refunds left and right to honor their security terms leaving the seller in a hole to rot with a fat negative balance.