I am not sure how you have come up with the idea that monetizing Public Domain content is an acceptable and valuable addition to Hive ecosystem.
I expected that someone who created an app for Hive ecosystem would understand that such content would be considered exploitation that adds no value/original content to the platform.

It's effortless spam of copied and pasted public domain images in an attempt to monetize it.
One post with 50 cents may not be much but it multiplies if the user posts similar content every day.
The exploited rewards grow exponentially when there are more users showing up to repeat exactly the same type of posins.