Why would no one care for plagiarized contents of whitepapers?
Because people are stupid. I would wager that >90% of people throwing their money away at scam ICOs don't bother to read the whitepaper. They just see an ANN thread promising to quadruple their money in a month or something equally outrageous and their greed drowns out what little sense they have. Having said that, I bet that there's an awful lot of people who haven't read Satoshi's original papers either.
That's how it goes, the hope that they would get more money from investing in ICOs and that what ICO means to them.
Whitepapers, roadmaps and other composition for an ICO isn't really a thing to them as long as it is "promising" profit they would go for it.
Because investors only focus on profit, but they dont take the initiative to distinguish.