Let's keep this on topic: in what specific ways has postgresql been more open, and how does that lead to a better developer community and greater value for user

Let's keep this on topic: in what specific ways has postgresql been more open, and how does that lead to a better developer community and greater value for users? I happen to think the postgres docs are great, and they are open and free unlike the MySQL docs. I have tried following one MySQL doc, only to see it change later and have no way to see the old version. Not a problem for postgres. If you have some suggestions for the docs please submit them to the docs mailing list. Postgres also has 15+ years of history in git, which is extremely helpful. Honestly, I don't know where to start. Postgres is an open community project to the core and benefits from that in so many ways.