Would you still invest in something, even if you know it is a scam?
Of course no, I would not invest my money, if I know a project is a scam. Otherwise it would be dumb to risk any money for doing it. Scams are usually trying to look legit, except some ponzis/pyramid schemes which speculate to earn money from people who are doing this as a business to try entering first and get paid out. I don't think it's profitable for them, maybe they are naive, I don't know.
If I invest in a known scam I would hand out my money to the scammers (they always make profit in a scam).