Oh geez. GM would find a thousand loopholes to skate around responsibility; i.e. blaming it on the phone manufacturer for changing specs, software, design, etc. They could even claim protective cases impede the charging. There are WAY too many variables at play here to prove GM knowingly prevented some vehicles and/or phones from charging properly.
Perhaps you'd find quicker satisfaction by setting up a GoFundMe so you can buy a module. Hell, if all of us who've told you to buy one and move on contributes just a couple bucks, you'd have one by now!