Is there any way to buy BTC for PayPal and be secure as a seller? Like buying some item/gift card/voucher with PayPal and exchange that item instead?
Yeah, I mean you could theoretically use PayPal to purchase something like an Amazon gift card (or, maybe, a Visa/MC prepaid card), and trade that for BTC. But you will end up paying for fees and what not.
The real problem with PayPal is not sending money, it is accepting money. Because PayPal has a notorious history for seizing large accounts and refusing to return the money to it's rightful owner. There's nothing you can do in that situation as PayPal is not a bank in that it's not regulated and, thus, not FDIC insured.