I have both a new electric Audi and new Tesla. In either car I can just remove the sim and it'll completely disable all of the internet based features. A lot of the FUD around new cars is spread by grumpy old automotive journalists.
Wait until they put in eSIMs. Those you can probably disable as well but with a different level of expertise. Or you can damage the antenna or just stick aluminium foil tape onto it.
If you were to remove the sim card, would that void your warranty with either of those manufacturers? If so, that is not a long term solution, unfortunately.
