[gowld]

Chargebacks aren't a risk between cardholder and bank/processor. Vendors pay chargebacks, so chargebacks are a risk between vendor and bank. If a vendor is high-chargeback, or at risk of not paying back chargebacks, bank/processor should ban the vendor.

non-payment of credit card debt is risk between cardholder and bank/processor. bank/processor should prefer to ban customers like this, not vendors (if possible). Customers can "launder" money through many sources (cash advance, cashback, shady businesses) if they intend to put that money in a speculative investment and maybe not pay back the debt.

bank vs processor is another dimension of complication to sort out.