Sure, but when you start building your business you'll probably do some kind of risk analysis and the risk that electricity is no longer available is catastroph

Sure, but when you start building your business you'll probably do some kind of risk analysis and the risk that electricity is no longer available is catastrophic but unlikely, while the risk that Microsoft discontinues a struggling in-app ads system they built as part of their largely failed UWP initiative that they've been signalling backing away from for the last four or five years is both catastrophic and obviously going to happen. Ditto all the Facebook game companies that got eaten when that platform collapsed. I know not every dev can afford a PM but every dev can afford to take a few minutes to do a risk document and check in with it every month or two. It seems to me there really was not a good business case for investing in Microsoft's ad platform to begin with.