@matigo It's more that the banks that payment processors have merchant accounts with that are blockers. But for Visa and Mastercard it represents more risk, since this area has more fraud, possibility of blending into illegal activity, and banking partners angry with them.
Porn has more fraud traditionally, so the entire category is considered high risk. TBH not entirely sure why banks care so much, Wells Fargo and Capital One are infamously 100% against it so Stripe can't process adult content.
One thing is for sure though: cryptocurrency-powered porn platforms are coming because there's no way they'll touch centralized payments. PornHub's already done it.