True, If the person you tried to trade file a dispute against you then for all you know you can't bring your BTC back to you. I think that if PayPal finds out you trade funds btc to paypal most likely the person with paypal dispute win.
That's why hindi iniencourage ang BTC to Paypal exchange transaction dito sa forum.
You only trade with trusted people in the forum, for lesser risk.
Also, you can request that funds will be send through FF, so it could not be reverse.