Alignpay.com is a newer payment processor that was started by a former fox news host and supports high risk, which likely includes pornography.
I should note the terms of service seem incomplete and it lacks a customer payment account system so it appears to be geared towards online merchants rather than independents who do crap such as commissions.
It's true, though gab is surviving due to popularity and allowing speech that twitter hates.
Minds is failing because they cannot compete with gab through popularity and refuse to compete through other means.