I'm forced to do this at work. It adjusts the net value to very close to zero. Github's pay per prompt pricing model is phenomenal for users to the point of blowing Anthropic's subscription offering out of the water, much less API pricing. At Copilot pricing, it's quite a useful tool if carefully managed. At API pricing, it's very hard to find a use case for AI.
Of course, I have no idea how MS is justifying the Copilot pricing. I can't imagine any world in which it is sustainable, so I'm trying to get as much as I can out of it now before they jack up prices.