Removing network connectivity from basically any new car is trivial, often as simple as pulling an easily accessible fuse.
I'm guessing that you haven't actually done this on "basically any new car".
If you had tried, you would know that there is no fuse dedicated to "network connectivity". It is typically tied in with other, often essential functions like the engine control computer --- specifically in order to thwart a simple disconnect.
What I have seen done is to tear into the right roof pillar and cut the wires going to the antenna on the roof. But this is usually not without consequences as well such as a perpetual error code display and/or the radio, navigation or entertainment functions stop working.
I'm guessing that you haven't actually done this on "basically any new car".
If you had tried, you would know that there is no fuse dedicated to "network connectivity". It is typically tied in with other, often essential functions like the engine control computer --- specifically in order to thwart a simple disconnect.
What I have seen done is to tear into the right roof pillar and cut the wires going to the antenna on the roof. But this is usually not without consequences as well such as a perpetual error code display and/or the radio, navigation or entertainment functions stop working.