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Yeah I agree with what your saying here completely. There are literally hundreds of Chinese companies on Alibaba etc. No doubt there are some that should be avoided like the ones who do actually put on logos and try pass them off as the genuine article.
Its the reputable Chinese companies like dengue, hongfu, farsport etc that I think produce goods on a par with the big name brands.
TotalShanner
The difficulty with this argument is whether or not the bars are the 'exact same'. It's easy enough to copy the external shape of some handlebars. A 3D laser scan, or simply a CMM arm will provide you with the external shape, and once you've got that it's straightforward enough to produce a mould using the 3D CAD files. Use that mould to produce a copy and you'll end up with something that looks identical to the original. To be honest, a decent tool-maker with nothing more than a ruler and some vernier calipers could knock something out which would fool anyone who didn't have decent metrology equipment.
However, there's no guarantee whatsoever that the carbon used will be the same. The original layup could use twill, plain weave or UD carbon or any combination of them. If it's twill or plain it could be 1k or 2.5k or 3k. It could be high modulus carbon, like Toray 700, 800 or 1000, or it could be cheaper and less stiff carbon strands. And then there's the orientation of the fibres in the layup, which is critical to both stiffness and strength.
Of course, there's also the resin system. OK, it's probably epoxy, but is it prepreg or resin infusion? Is it an internal bladder system or a solid mandrel set-up? What's the chemistry of the resin and how effective is it at wetting out the carbon and what's the consolidation ratio when it's cured?
You can't tell any of this by looking at it. The bottom line is, you can't tell without a rather expensively-equipped laboratory. Don't get me wrong, I have nothing against Chinese open mould carbon stuff. I've got a Hong Fu 29er frame which has served me very well, and a Gotobike road frame which has been excellent. I'd have no hesitation buying from either company again, as both seem to be well-established and reputable resellers.
On the other hand, I would be much less inclined to trust a company selling counterfeit knock-offs. A company which bases its business model on copyright infringement is not one I'd want to trust my safety and well-being to.
But, as ever, YMMV.