Owners of photoshop don't get free updates even though they own their computer. Software costs money to develop so saying all updates should be free simply because they already own the hardware doesn't makes any sense.
A more fitting analogy would be Apple charging you to upgrade your BIOS.
Updates to things I trust my family's life and health to should be classified like recalls, a sign of manufacturer failure and not a consumer privilege.
To be scrupulously fair, that's true of all software; it's just more important for safety-critical software, because safety-critical software is more important.
But modern luxury cars also feature many components that have little to do with safety.
If you buy a camera, you get free firmware updates; your phone gets free updates,...