Who and when did this happen? I've mostly seen the victims losing their money and the scammers earns his money back with chargebacks. I've been using PayPal since 5 years and still I say that it is the least secure payment processor due to their chargeback policy.
Their fee is also very high and hence bitcoins are considered the safest option for users who don't want to get scammed and most don't deal with PayPal unless the buyer is trusted.