How is it different than the company making fake rhino horns to flood the market to fill the demand and reduce harm to real rhinos?

https://www.usatoday.com/story/news/factcheck/2021/06/10/fac...

I don't know enough about how the market for rhino horns works to say. If putting fake rhino horns on the market encourages a more thriving market for rhino horns that then places a premium on real rhino horns, it can indeed be harmful to supply fake rhino horns: the practice will then have a foreseeable net effect of killing more rhinos.

so if it's availible for free, it's okay?

No, and for the same reason.