I wish this were true, but it's not that simple. For businesses, there is a lot of 'unknowns' with Crypto. It's regulated differently across jurisdictions, and Crypto in the USA is subject to things like anti-money-laundering and different taxable events when it's exchanged.

Many of the adult sites that have tried using crypto for payments have reported that less than two percent of their users are willing to pay with crypto. Until it becomes as easy as using a credit card or PayPal, crypto isn't going to be the savior of adult content.

"Well they're private companies." The pro-censorship puritans and meddlers love farming their oppression out to monopoly corporations.

Many vendors do block sales of firearms (or anything resembling 2A) due to similar risk factors. It's extremely difficult to find a gateway and processor that's 2A friendly. The small number of vendors that are 2A friendly usually require an FFL to further mitigate risk.

If you can find a gateway and processor that has an underwriting team that will not require an FFL, that would be a sight to behold.

It's often the banks who block the processors. (If the processors block it of their own accord, it's due to fraud/chargebacks).

I am not sure why the banks are so puritanical.

I suspect the fraud rate for porn is much higher than for most other categories and the cost doesn’t make business sense.

Their policy prohibits "certain sexually oriented materials or services".

https://www.paypal.com/en/webapps/mpp/ua/acceptableuse-full

Paypals policy bans using it for payment of any digital adult content [0]. Many artists still use it for nsfw commissions, but every payment is a risk of getting your entire account banned simply due to a bad comment in the note field.

[0] https://www.paypal.com/us/smarthelp/article/what-is-paypal%E...