I don't know about recently, but for many years paypal automatically sided with the customer.
We had many customers that would buy a 1 month sub then chargeback the whole amount after using it heavily for a few days or right before renewal, with a nonsense reason like "item not as described" or "unauthorized charge".
I also had this issue. PayPal said to gather more data like proof of use, IP addresses, etc, and I still lost every time. I even had a couple of people be surprised that their account stopped working after they did a chargeback…
We had many customers that would buy a 1 month sub then chargeback the whole amount after using it heavily for a few days or right before renewal, with a nonsense reason like "item not as described" or "unauthorized charge".
We lost every single case.