Yes they should be punished most especially if there are evidences that prove that they did scam people. But mostly these scammers would run away right after they commit the crime and would not return back on this forum.
This should really be the case but how you would accumulate evidences? We wont even know on where those funds do go thats why scammers wont really go out into this market because executing it would really be just easy.
I want to say. Some projects may be deceptive, but they are not something that managers have. That's why I suggest you go to trusted managers' campaigns.
I would definitely recommend you to enter if the project is good.
But it is the best way to punish those who share projects that are usually scam.
Not only depending on reputable managers because there are still chance for the project to become scam but reputable managers do always choose the best ones thats why its high chance for a worthy project to invest on but we should mind the risk.