If they were free on demand for people who asked with their purchase:
None of the people who need them would get them.
Most of the ones that did get handed out would still be to people who never used them.
Because there’s very little overlap between people who need them and people who know that it’s an option.
The people claiming them would primarily be people like me who do know how it works, know that I probably won’t use it, but am going to take it anyways, because it’s free and because it is within the realm of possibility that I need another cable as a temporary replacement until I get another one.
Simple solution: if a device you sell comes without charging cable, it has to be written in large letters on the box that you have the right to claim one for free (like cigarette health warning) and the seller has to inform the customer before checkout
