It's not obvious to me that CC companies are acting out of political leaning, it could conceivably be mostly risk based.
There was a flurry of congressional bills specifically citing that article at the time. (Here's one for example: https://www.businessinsider.com/bill-introduced-criminalizin...) I can't find one that specifically threatens the payment processors, most go after the sites or their hosting providers, but the payment processors probably had the sense to realize they were in the blast radius and that it was best to pre-emptively self regulate.