Yeah I think you may be focusing on the "creative art" aspect of this and less on other use cases. My mom is a retired photographer and she loves seeing other people use or repurpose (and yes even sell) some of the pictures she takes. In public libraries we want a way to share images the widest way possible and don't always have our own space to do that.

I get that you're concerned that people don't understand the public domain, but I think the response to that is more (and better) explanations about what it is and why it's important, not disallowing people access to tools that they want on a platform they use.

Which is a case where she should use CC0 and not the public domain marking.