The slimy ways in which manufacturers and suppliers force themselves within private transactions of goods have to be stopped.

I wouldn’t be as upset if it produced a message: “Hey, we’ve noticed you’ve just got this used product! Would you like a tune-up, onboarding, warranty etc. for $X00?”, but you can decline and still use it. The fact they disallow resale unless they get a cut is unethical and unreasonable.