Re: that Kijiji scam for PSVR above ... Can someone please explain to me how PayPal can be used as a scam? Are my eBay transactions through PayPal at risk?
https://myria.com/how-to-avoid-some-common-craigslist-paypal-scams
As for ebay, selling intangible items like digital codes and what not are the biggest risk. All the buyer has to do is claim it was not them and it can result in you having to give them a refund, or worse, if they decide on being extra shity, they contact their credit card company directly and cause a chargeback via paypal.
And thanks to their policy of not letting sellers leave negative feedback for buyers anymore, you never know who might be a scammer. And there are instances where legit accounts get hacked and used as well.
Physical items you can at least get serial numbers, documented proof that you had the item in posession and sent it out to a specific address with a tracking number and can also get insurance via the postal service you're using. It's relatively safe. But there's no real way to outright dodge a scammer if you're selling.
If you're a buyer though, nothing to worry about. Ebay will bend over backwards to rule in your favor as long as you didn't directly get in touch with the seller and send them the payment off of ebay.