This would be hard to determine. I mean, I think it's even possible to lie about the origin. As some people said here, expect plenty of scam from China, though that would be more due to the sheer number of bitcoin users there.
I personally wouldn't put money on these. I mean, new coins are a dime a dozen. Even for those that manage to get through ICO and finally start trading, what are the chances you'll earn a profit? For all practical purposes, many coins are just pump and dump for whales.
It's too hard to know what is or isn't a scam. In the ICO world, I think it's safe to have a mindset where everything is a scam by default.
China has tons of people so statistically tons of scams are going to come from China. They say the chinese love money above everything else because coming from communism they now want to get their hands of all money. I don't believe in racial generalizations tho.
Just go project by project and evaluate.
I think this is pretty much the stereotype for the Chinese wherever they are, even for the Chinese that never lived through communism (like the diaspora in Southeast Asia for example).