There is a distinct Postgres entity which doesn't upsell, that's true. But looking at https://www.postgresql.org/community/contributors/ https://www.postgresql.

There is a distinct Postgres entity which doesn't upsell, that's true. But looking at https://www.postgresql.org/community/contributors/ https://www.postgresql.org/community/contributors/ it seems like most of the actual people are employed to work on Postgres by companies who sell, among other things, proprietary Postgres derivatives and tooling. Maybe if one company came to dominate the list we'd be in trouble..