In my memory it used to be more common to have a colophon on a website or special projects. I always enjoy things like this and when I teach the students are required to create a colophon as part of the project grading rubric
It is easy to forget what it is like to be a beginner, even for those in the current generation growing up with so much technology. I think they are great for helping expose people to ideas, tools and software and give them leads on how they can create similar works. Even if a project can't be open source there can be all sorts of valuable info in just listing the underlying tools / software / libraries used.
A few good examples https://indieweb.org/colophon