This is the equivalent of saying that MS Outlook is a community. It's not and neither is Lemmy. Each server has its own rules, and each community on those servers can add rules beyond that.
Address a specific community or server, there's no central control over the fediverse.
Or if the fuses apply to too broad of a system, the wireless modem should be able to be disconnected.
Manufacturers like to implement this capability using modules which can be used across their lines of vehicles. Here's an example for a 2017 Silverado, but you'd want to research service manuals / diagrams for the vehicle you're considering buying: https://www.silveradosierra.com/threads/2017-silverado-removed-lte-modem.660593/