I have recently send money to my brother through paypal because i wanted to try if i can dispute the payment. If i try to dispute it then this appears:
"We're sorry, but this transaction cannot be disputed because it is not a purchase of goods or services. Please contact the recipient directly".
You have to contact your bank and they will chargeback for you. The issue is that many people here could be using stolen paypal accounts or debit cards that will be reversed and marked as unauthorized transactions.