I can definitely see this as something to bootstrap a backend quickly. It could serve as a nice in-between of Firebase/Supabase and a fully fledged server.
It took me a long time to grok the docs though. It would be great if there were more simple examples. The landing page refers to a lot of the nitty-gritty details, including method names and services in the architecture, but imo that's getting into the weeds before explaining the value prop. I also had a hard time figuring out the apidemo page on my phone screen.