It's easy for me to say because I don't mind old cars, but you really don't have to go that old to find something without ad-tech or tracking. You can have a completely acceptable experience in say a 2015 Toyota Camry or Crown or whatever equivalent you get in your country, with lane assist and excellent safety, but no phoning home.

The answer really depends on how much you don't want to be tracked, is it a big concern worth a lot of effort and compromise, or do you just kinda wish it wasn't happening?

If the former, there are plenty of vehicles to choose from the relatively recent past. I haven't looked into it but I imagine a lot of cars could have their phoning home disabled too, and it'd be surprising if all of these cars will be paying for an internet connection/SIM for decades to come so eventually the modern ones will fall off the net anyway.