Datasets for Reconstructing Visual Perception from Brain Data

There was this research where faces were almost perfectly reconstructed from money's brain signals. How were they able to achieve such perfect recreation from monkey but not even close from human brain.

https://www.bbc.co.uk/news/science-environment-40131242

Is there a case for non-dystopian applications for such a project, should it succeed?

I get that we're all driven by curiosity, and the brain is very mysterious, but at some point I really wonder when scientists will start to taboo projects like this for ethical reasons, just like they currently taboo human cloning.