There are a few tiers of fake products. The same is roughly true for sneakers, handbags, etc.
(A) Real products that are being sold on the black market, think of these as stolen from the factory. They're cheaper because nobody is paying the royalties.
(B) High quality knock offs that are made at the same factory with the same materials and tools. These might be slightly less well made.
(C) What you think of as fake. Just junk.
Most people encounter A and B without ever knowing it.