My solution was to buy a thumb drive for my KIA and load up a bunch of MP3s. The cost to this is that it takes a little time and knowledge. It can be a pain to organize all the files and make sure they are compatible with my car. Initially I put a bunch of .wav, .wma and .ogg onto the device and then wondered why I couldn't find any of my files. What a fool I was. The MP3 seems to work so I have stuck with that. Other file types can be converted. Now I just have to track down some files.
Is there a famous person you follow? I'm sure they have a TED talk on YouTube that you haven't had time to watch. Download it an put in on your thumb drive. Maybe you want to learn about world history? Audio book? It can all be converted into an MP3 and put into your car for free if you know where to look.
Should I be concerned that I'm not learning about the latest and greatest whatever thing is on the market? No. There are so many ways we are being advertised to today that if something is really important and interesting, it will find its way to you. We only have so much time and attention in this life. We shouldn't just give it to some advertiser. Give me a dollar, then I'll subject myself to your advertisement. Right now people have it backwards. Pay for a subscription and then you can have an ad. free experience. As if that was possible. There are advertisements right in the content.
Very few people can live an advertisement free existence in America anymore. The best we can do is try to keep out as many as we can. That's what I like about Vaporwave music. I turn on an hour long collection of beats and random sounds then it takes me away into imagination land. I don't need another advertisement for Jared, the Galleria of Jewelry in my life. Ever.