Chinese companies that produce for foreign retailers generally take the same stuff they make (even if from protected corporate designs) and sell it elsewhere and so undercut their original buyer. There's zero respect for copyright or intellectual property. If they can make it or can reverse engineer it to steal it, they will. If they can cheapen the quality to add a few more cents to their pockets, even if it ruins the usability of the product, they will. Unless someone is sitting on them and guarding everything 24/7, it will be exploited. Tainted food, tainted health products, unsafe everything from dog and kid toys to toothpaste to medicines; products that look like they should work and self destruct in a matter of days, where the same thing made in the USA 30 years ago still works or is repairable? It's shameful.
The stuff they sell direct will most likely have no ethical quality control so you'll have to take that gamble, and there's no recourse if something is wrong, unless PayPal backs you up.