You get scammers all over the world.
"Alibaba" is not a scammer as such but is merely the vehicle for criminals to operate.
I went to several sellers (so called Manufacturers) who were quoting me prices FOB ex China in US Dollars that were much more expensive than me buying the products in New Zealand at retail prices in New Zealand Dollars.
I dont think I will be dealing with those companies in my lifetime.

Then there are the businesses that promise the earth but when you ask for a sample of their product to evaluate, their Send Cheque or T/T emails stop coming.

Shame because the "Alibaba" site is a good concept.

BUT YOU HAVE TO BEWARE