Earlier quoted context omitted.
Wikipedia is full of the kind of stuff mainstream payment processors balk at, so they might have to use a higher risk processor with higher fees.
Easily Checked: Wikimedia accepts Paypal, Apple Pay, Google Pay, Visa, Mastercard, Amex, Check, ACH and Money Order. Pretty hard to argue that mainstream processors don't like them. Processors charge higher fees to merchants that are in lines of business with high fraud and chargeback risk, has nothing to do with whether they agree with them morally. They refuse merchants with business they don't like. If it were the…
Its actually somewhat common for people who steal credit cards to use non profits like wikipedia to "test" them. Typically such sites have no minimum donation, have donations from all over the world so fraud detection wont think its weird you're spending money half way across the world.