The easy solution would be the simply disallow card transactions for Gab but allow other stuff. There is more to the financial industry than credit cards. In t

The easy solution would be the simply disallow card transactions for Gab but allow other stuff. There is more to the financial industry than credit cards. In the EU you have SEPA which basically allows you to charge a bank account like a credit card (though if you're high risk you'll need written consent from the owner).