You can get scammed with any payment processor, it all comes down to who you do business with and the type of business.... If you paid for something and did not receive an item there is recourse in the form of disputes / chargebacks. In the case where you are owed money, in such case you should always receive the money first and deliver the product or service after payment........
What type of deal did you engage in ? Please be aware also that a common way of getting scammed is through personal exchanges, where 2 individual users deal an exchange from one currency to another.....This is a good way to get scammed since there is no possibility to dispute and it is against PayPay'l TOS to do ANY exchanges.
Sorry you got scammed!
I have used PayPal for so many years, thousands of $ in purchase and in money received never a problem. I always deal with LEGIT and established sites.
Perhaps you can share your experience ? How did you get scammed ?