The author is mad at Stripe and PayPal for banning transactions involving unicorn wieners but this is imposed on them by the backing banks.
The reason behind banning adult materials has to do with Puritanism and with the high rates of refunds on adult websites.
I have an issue with Stripe or Paypal banning merchants without recourse that do not sell adult stuff or anything else bad/high refund, just because 'AI flagged the account'. And I know from Paypal that they have used 'AI' (statistics) to flag accounts, without recourse, almost since they started. It did cost us a lot of money; we had no refunds or anything and paypal was simply (in email and on the phone) repeating that there was no recourse. We moved to an EU system which we are using for 15 years now and never had any issues of course (as we never did anything weird, ever); also, I can call them or visit them if anything happens unlike the impersonal big guys. Far cheaper too. Screw paypal & stripe (their fees are an absolute joke, no idea why they are so popular), thanks.