I've had and heard somewhat similar experiences as the person you are replying to. Buying? No problem. Selling? An error, but only once you go the actual page to do it. No notification on the main accounts pages and no information with the error. Just something like 'there is a problem please contact support' (which of course means waiting a couple of business days).

If I want terrible, uninformed, opaque service only when it is convenient for the other party, I can already get that at every bank I've ever dealt with.

You could be better than that, but it is hard to believe that that is what you are trying to do.

From your link: "As a result, the decision to support a business is not solely up to Stripe; it involves the various financial companies in the credit card processing chain. Their restrictions tend to be broad and, as a result, often pretty confusing."

You don't deal with visa/mastercard payment network companies do you? If not, how can you have the same rationalizations as Stripe? And of course if you share the same problems as credit card companies (of which there are SO many), what problems are you solving?