Have encountered lots of it but tracing up which is copied or being copied would be hard if you just read up few numbers of whitepapers. Plagiarism is always be a bad thing yet there would be no originality or just simply copy others work just for the sole purpose of scamming.If a team cant make their own then most of the time they are building up an another shitcoin in the market.
There no way we can stop these things because projects will pop out just like mushrooms continuing on copying WP anytime if they do like to.