Your parent argues that you probably can't make this illegal without fundamentally changing what it even means to own something. This is actually a very analog

Your parent argues that you probably can't make this illegal without fundamentally changing what it even means to own something. This is actually a very analogous situation to DRM/right to repair etc: when you've bought a device, you (should) have the right to do whatever you want with it, take it apart, modify it, use it in unintended ways and even destroy it. The seller should not have any legal rights to curtail any of these actions. The same principles applies to buying a company.