I don't think it matters either way... If it was cash spent on AWS, it would be a business expense and the total amount given to the taxman would be the same by all parties right?
Misreporting income is not a great idea even if it doesn’t change your tax liability. That said, I think of the “credit” as an elaborate discount or coupon system. Any CPA worth their salt could find a justification for why it’s not income.
