to answer #1
- stripe: https://stripe.com/restricted-businesses
"Pornography and other obscene materials (including literature, imagery and other media) depicting nudity or explicitly sexual acts; sites offering any sexually-related services such as prostitution, escorts, pay-per view, adult live chat features; sexually oriented items (e.g., adult toys); adult video stores and sexually oriented massage parlors; gentleman’s clubs, topless bars, and strip clubs; sexually oriented dating services"
- paypal: https://www.paypal.com/us/smarthelp/article/faq569
"We don’t permit PayPal account holders to buy or sell: Sexually oriented digital goods or content delivered through a digital medium. Downloadable pictures or videos and website subscriptions are examples of digital goods.
Sexually oriented goods or services that involve, or appear to involve, minors.
Services whose purpose is to facilitate meetings for sexually oriented activities."
- amazon: https://pay.amazon.com/help/6023
"Adult Oriented Products and Services — includes pornography (including child pornography), sexually explicit materials (in all media types such as Internet, phone, and printed materials), dating services, escort services, or prostitution services."
so on and so forth. it's questionable whether this site would break those rules, since they aren't directly selling anything. otoh, it's likely the payment processors would shut them down and so probably not worth the risk.