The dispute rate is certainly true for companies under the general umbrella of “subscription services”, usually meaning porn / webcam sites, and there are trigger points where the payment processor will switch off a facility that exceeds a certain dispute volume.

OF has been increasingly making use of step-up authentication to avoid disputes, which is the way the non-US payments industry is heading. My guess would be that if disputes are in fact the reason, it’ll be because the step-up authentication isn’t available or working for some significant slice of the market.

That said, I don’t think that’s the reason. Switching off porn altogether means the vast majority(citation needed) of OF’s content will be gone, which means this has to be a life-or-death move. MC has been placing legality/consent/age restrictions on adult content, including real-time monitoring of content / chat [0]. My guess is that this is onerous enough that it breaks OF’s business model.

[0] https://www.webshield.com/post/mastercard-introduces-revised...