[theshrike79]

The "fakes" are usually off pieces that didn't go through the official quality control.

The easiest way for you to demonstrate this is to get some official Legos. Then go on Aliexpress and order some no-brand knockoffs (Lepin or whatever they're called now). Both work as building blocks, both connect to themselves and each other.

But you can just feel that the knockoffs haven't been produced to the same exact standard as the officials, they're just a little bit off and squeaky and wonky.

Now if someone sold you the knockoffs as officials, it would affect the Lego brand. And this is why companies go to court for.