You said that correctly: counterfeit products. While Apple fanboys no doubt will claim that these OnePlus products are counterfeits of Apple products, that's mostly just their ignorance or wishful thinking talking.
From what I can see, there is no actual counterfeiting involved here. This product is both generic enough in design and not brandishing any Apple specific markings. Also comes with a box that makes it clear it's not an Apple product.
Sure, Apple might not like that people can walk around with something that looks similar to their overprices exclusive stuff, for a lot less. But that's not a valid definition of counterfeit. You see, it's missing the "fraudulent" part in the "fraudulent imitation" definition of counterfeit.
Maybe Apple should not have made their things look that generic. They might have a case if a logo or other protected asset was imitated. But this is not a clear-cut case. Rather one that should at least have a court rule on first.
The elephant in the room here is the USA showing what it can do (pretty much with impunity, short term at least) to a Chinese company. Long term, that will prove incredibly dumb and costly for the USA. But not a single person in government, nor any American company executive, will look that far ahead or even remotely care. By that time they are already long gone, pockets filled with short term gains and someone else to deal with the negative consequences.