I've never used their dispute system, and I don't think that holds much value in Europe. At least in Germany a contract is a contract, if I claw back the payment the other party will just start the collections process. A process that has teeth and generally will recover the money from me, worst case by garnishing wages.

On the other hand Visa and MasterCard are not neutral actors. They have used their market power in the past to pressure merchants to change according to American moral values. And with the current administration I have little faith that this will stay at moral values