Cheap carbon-fiber handlebar from Hong Kong. Will it break?
Maybe.

A lot of (all?) pricey carbon stuff is made is made in the far east, and much of it in the same factories with the same moulds.

What you're paying for is accountability really. When you buy a pricey carbon widget you're moving the responsibility of making sure it's ok from you and onto them.

Any company with a valuable reputation is certain to have invested at least some time and effort into design, testing, insurance, etc.