I've always assumed that the modules I've received from China with bent header pins were the result of poor packaging and damage during shipping. A bare board in a poly envelope with no padding vulnerable.
This picture came from a Banggood ad that popped up in my Facebook feed. The header pins in the picture are already bent! Wow.
Please, don't take this as an invitation to disparage all things Chinese. Modules like this offer an incredible value and innovative designs.