[onion2k]

if the service running your actual business logic dies

In a modern tech business that's everything from the frontend to the database though, including all the bits to keep that running at scale. That's too much for most companies to handle when they're starting and scaling. You'll need to compromise on that value early on, and you'll probably persuade yourself that it's tech debt you'll pay off later. But you won't, because you can't, and that will lead you to dislike the system you built.

It's much simpler and more motivating to accept that in any modern tech business has to rely on third parties, and the fact you pay them money means they probably won't screw it up. It has to be an accepted risk or you'll be paralysed by having too much to do.