Can you sell DLC on Apple Arcade? On the Google Play Pass games all the dlc is included.

See if your car is on the website niftycity you might be able to get a piggyback adapter from them to run Android Auto & Apple Carplay through your OEM setup.

They no doubt sell rebranded versions of the same stuff you can find on AliExpress but they do the hard parts of working out all the bits to make it all nicely integrated with the OEM setup rather than having to research which obscure cables you need to buy.

No you have to edit the file for CD metadata and convert it to flac so you can pretend it was ripped from a CD, as is P2P file sharing tradition. Bonus pts if you put it through some filter to introduce a bunch of noise into the audio. Then ask in chat how you can convert a 128kbps mp3 to flac to increase the quality. Priceless.