Preventing chargeback as a seller

Hi there, i think there is one way how to prevent paypal chargeback when you are unsure about the party you are exchanging money or selling him some service.

How to prevent paypal chargeback then?
1. That person can initiate chargeback after he send you money.
2. Then he cancel chargeback, so he cant initiate it again.
3. You transfer another ecurrency money, item or service to him

Does this method have any downsides? Did you tried it?

Here are advices on how to win PayPal dispute/claim as a seller: