Its funny here how you kept leaving out Macbook, macOS = Carplay. If you say the printer is own by me and Applepie mini is also OWNED by me.You don't seem to understand what licensing and trademarks are all about. Apple doesn't own the printer. You do. That is why it is a bad analogy. Apple however OWNS the CarPlay software and therefore THEY decide how it gets used. CarPlay isn't owned by you. It is owned by Apple and Apple lets you use it... PROVIDED you meet the requirements:
There is more if you wish to read:
The point is however that ApplePie Mini is not CERTIFIED BY APPLE to work with THEIR licensed software... which IN FACT makes it a "hack".
None of that matters (to me anyway). What matters is that Apple tests all their CarPlay updates with licensed machines like Pioneer, JVC, Alpine, etc... to make sure it all works. They do NOT test the CarPlay updates on hacked machines (like the ApplePie).
So... maybe one day they update CarPlay and ApplePie can't work with that update.
If you say macbook and macOS is OWNED by me than I can connect whatever I want to the laptop than we have a different story.
Of course they can update carplay software, like I said before how much trouble car manufacture willing to go through update the software? It's not like an Iphone can be done OTA and force them to update the last IOS. Even Apple force car manufacture update I can still choose not to update.