"a. Illegal Activities b. Certain Adult Oriented Products and Services c. Illegal Drugs d. Counterfeit Goods e. Gambling Businesses f. Money Making ("Get Rich") Businesses g. Tobacco Products"

Source: https://www.simplify.com/commerce/docs/misc/legal/merchant-t...

Much, much less restrictive than Stripe, and cheaper to boot. Now adult websites can switch to this instead of CCBill (which I find more sketchy.)