Despite the official bug bounty page for OpenAI having "accounts and billing" as a valid category, when I reported a bug that lets anyone subscribing to ChatGPT a) choose any country, that doesn't have to match billing address, to pay a lower price (since some countries they charge considerably less than the equivalent US price), and b) set the sales tax to 0%, even if both the country selected for price AND the country of the billing address both have legally mandated sales tax / VAT - and their response was that it was considered out of scope and not valid for any bounty.