Often it is, and often it isn't. Sometimes the same manufacturing facility will have different quality standards for different buyers, and the distributors run by people who own yachts will not accept the same level of defects as the others. Name brands have to stand by their products and provide warranties, because their name is supposed to mean something. Random shell companies that exist only to sell knock-off products don't care if your charger stops working in 6 months.

I'm not suggesting you have to buy name brand shit, because in practice those companies have demonstrated that they aren't as committed to quality as one would hope. But if you're buying an $80 Samsung product for $25 from Symsnug Ltd, you have a much higher chance of throwing it away.