I had a mate who insisted I put some knock off 3T’s on his bike. Didn’t pass the car park test, first small load they cracked at the thickness transition to the point they went floppy. This was the drop off of a residential curb. 80-100mm drop. Far from extreme
Now I use them in the vice to mount brakes to while bleeding.
98% of the bars being sold cheap are counterfeit, the rest are QC failures.
Remember, pretty much every industry bar (hehe no pun intended) the bicycle industry tests their carbon in the final QC stage before shopping out.
I suspect quality carbon bars will gradually fail, announcing via large cracking noises that fibres are snapping. Cheap stuff, probably a catastrophic failure.
When you end up at the dentist with a busted face, ask him to call his new car or boat after you.