[BillinghamJ]

You misunderstand, it is indeed an issue of their chargeback rate as a platform - not isolated to particular merchants.

Having high rates has significant consequences - leading to fines from card schemes, lower authorisation rates from issuers, higher interchange costs as it harms negotiations for custom deals with issuers.

Even quite small numbers in the enormous pond of PayPal can have serious impacts when it's well optimised.

Also keep in mind, where it is possible to do this kind of thing, it can very rapidly grow to a huge problem when fraudulent end users learn they can do it.