Have a look at https://github.com/bitnami/containers/tree/main/bitnami/post... as example.
It might be worth a commercial license for some of their current user-base, no doubt.
They likely hold a copyright on the exact expression of their documentation, but the facts and information in that documentation, and necessary configuration such as port numbers, and dependency selection are not subject to copyright.
After having been burned several times by images I prefer writing my docker images from scratch (based on the Debian or Alpine images) for production systems. I only use ready-made images for quickly getting something running locally to evaluate it.
This is what happens if you merge every feature request you get and do not have a clear plan or architecture. After reading the code I am happy they are deleting the images, at least if this one is typical.
As a PostgreSQL expert I can write a much better image which suits my needs in one day, which I have also done several times. It would be harder for a non-expery but I do not think a non-expert should use this image due to some footguns I spotted. This kind of generic image is a bad idea and very hard to build.
Could you elaborate on your findings?