Stories like this almost certainly exist for Visa and Mastercard too. The set of credit card companies that have no instances of an event like that is null. So if you want to avoid any credit card company where someone has had a bad chargeback experience, you're just not going to be able to use credit cards.

To note, Amex is both a payment processor and a card issuer - Visa/MC aren't card issuers, so chargebacks aren't decided by them, they're decided by the issuing bank.

Amex has by far the best record for customers wrt chargebacks. Most companies I start do not even accept Amex for this reason. I had contracts with them in the past where we were not even allowed to fight chargebacks in the first year of the account.