For electric vehicle use, wrapping cells interferes with thermal transfer ability. Since most people don't want an electric vehicle that takes more than an hour to charge when traveling long distances, thermal transfer and thermal management makes for different designs than for solar energy storage. The unwrapped cells with no studs is exactly how the cells come off the production line after layer formation and testing. EVE can and will wrap cells, and weld on terminals, but you pay extra for that. Cells that don't meet the EV specs and are thus sold to a different market would almost never be wrapped or have terminals or holes. Nothing nefarious here, they are simply wrapping the "failed EV grade A" cells and getting them in a condition where they a more marketable commodity. The secondary market uses the same material to wrap the cells, but you can actually tell the difference in workmanship when you compare side by side with EVE wrapped cells, and the "genuine grade A" cells that failed and are wrapped by vendors. The majority of "not grade A" cells sold as "genuine new grade A" are an excellent value, but at high C rates they will fail testing. Most people don't use high C rates for solar energy storage. The real problem is the vendors that are selling used cells as "genuine new grade A", probably thinking that people are buying grade B, they might as well make a tidy profit by selling former genuine grade A that are end of life as new.
If vendors would accurately label cells, it would help. It won't completely solve the problem, since EV pulls will still have grade A bar codes, just end of life due to capacity degradation. I disagree that the fraudulent adverting and deception used is a cultural thing, most Chinese are acutely aware of the fact that it happens. Indeed their purchase of things like baby formula from overseas sources reveals their distrust of any claims of purity and "fit for purpose" claims by local vendors. Vendors know what they are doing, and do it because there is profit to be made, and little chance of their being held accountable.