Re: "if you buy a product, you own it"
Not sure where you are but here in Oz that's not the case.
Same with printer manufacturers saying you can only use their inks or void warranty.
Powers that be said "Nope. Unless you can prove this ink was directly the cause of the explosion or whatever, no affect on customer's warranty. Case closed."
Of course, your mileage may vary ¯\_(ツ)_/¯
Biting the hand that feeds IT
