Creating credits out of thin air is impossible as all financial transactions must be accounted for. In the case of Azure credits, they will appear as increased revenue on Microsoft's balance sheet. However, if Microsoft decides to price Azure services below cost as part of their agreement with OpenAI, their profit margins will be affected. I highly doubt that is the case because the alleviation of cost is in the form of credits.

I would wager against comment 0 that said that this will materially affect earnings.