It's not clear to me that the _entire_ Neon stack is OSS and available to self-host (though they do share a lot of OSS code, which is great), and in any case, it's not currently supported/documented beyond some "local development" instructions, e.g. "We do not officially support use of autoscaling externally" [0]

> Can’t you use a cloud provider and have them host this for you?

If it really is all OSS, then I guess the moat is the impressive execution of this team.

[0] https://github.com/neondatabase/autoscaling

There are some sections of the code that is close-source. Like the Console, but the devs are very active in their Discord. There is a small community trying to self-host, and from what I have seen gotten most of it working. There isn't an easy way to start it up for a more junior developer, but if you want to self-host it you are able to since all "components" are available

The only component which is not currently open source is the control plane.