>At a smaller business I worked at, I was able to use these services to achieve uptime and performance that I couldn’t achieve self-hosted, because I had to spend time on the product itself. So yeah, we’d saved on infrastructure engineers.

How sure are you about that one? All of my hetzner vm`s reach an uptime if 99.9% something.

I could see more then one small business stack fitting onto a single of those vm`s.