After they sell it it's no longer theirs. Makita can't come to me and tell me what I can and can't do with their power drill, it's mine to do what I wish. They build it and sell it but once payment has been tendered that's where their possession rights end.
This is purely the choice of the vendor. Makita may not do this, but John Deere absolutely exert control over how their products are repaired and maintained.
They sell you a license to use the software, so you can't for instance redistribute MS Paint as your own software. But you could certainly hack it not to phone home.