I very much agree - the likelihood that your business will die because it just isn't great at selling stuff seems much greater than the likelihood that it will

I very much agree - the likelihood that your business will die because it just isn't great at selling stuff seems much greater than the likelihood that it will die because you get really unlucky with a service provider. THAT SAID, it seems worth it for even a really tiny company to spend a half hour thinking about "what would I do if github (or AWS or google or the app store or whatever) cut me off?" Probably in a lot of cases the answer is "call them and beg forgiveness" (i.e. if it's AWS), but for something like github it seems like "switch to gitlab" (or "deploy git server" or anything else) is a pretty easy move.