> Can you reduce it further? What if you don't require 2 cloud providers? What if you don't need zero-downtime?

I think the "2 cloud providers" criteria is maybe negotiable. Also, maybe there was a misunderstanding: I didn't mean to say I want to run it on two cloud providers. But rather that I run it on one of them but I could easily migrate to the other one if necessary.

The zero-downtime one isn't. It's not necessarily so much about actually having zero-downtime. It's about that I don't want to think about it. Anything besides zero-downtime actually adds additional complexity to the development process. It has nothing to do with trying to be large actually.