Called them out on Xitter.
#Stripe only reiterated their boilerplate: "We apologise for not having responded to you earlier. However, as mentioned in the Prohibited and Restricted Businesses here: https://stripe.com/en-gb-ca/legal/restricted-businesses, Adult content is prohibited as per these conditions."
They did not address the fact that they're supporting white supremacy. I looked in their policy, and I couldn't find anything that said they wouldn't do business with bigots.