For instance, I auctioned off a motherboard on Ebay. The guy paid for it with Paypal. Sent off the motherboard. The guy refused delivery, and then accused me of not sending it.
Being a nice guy, as he actually didn't receive the motherboard, I refunded the guy his money.
Then he filed a complaint with Paypal for me not sending the motherboard. Paypal would not listen to my side of the story at all, even though I had proof of shipping and proof of his refusal of delivery.
So then Paypal gives him the money (from my account) for the cost of the motherboard. So the guy walks away with my $200, and Paypal doesn't care, and does nothing, and actively seems to want this to be the outcome. This wasn't bad customer service. This was company policy.
There's a reason this site exists, and why I tell everyone to never, ever use Paypal if they can help it: