It all depends. Inexpensive and cheap aren't the same thing. I'm following a guy that has been running fake Brembo 6 pots on a BMW 335 for the last year. He has the same Brembos on his M3 and he's been comparing wear, hardware, seals, etc... and has seen zero difference in wear or performance over the last year.I sure hope not. Not sure why people want to be cheap about their brakes.
They are complete rip offs, down to brembo markings in the castings being present.
It's possible you can sell stuff less expensively with forced labor and completely stealing IP.