The warranty blackmail of rooting, driven in part by corporate greed and in part by bad rooters trying to scam the suppliers when they screw up.
Sprint (US carrier) came out with an enlightened service policy a few years ago. Take them your broken phone. They'd restore it to stock on the service bench. If it worked, you paid, if it didn't, it was a hardware fault and you didn't.
With an HTC, you go to HTCdev.com to unlock the bootloader and you decide before proceeding to give up the warranty. You know what you're choosing.
Because of the fraud aspect, I can see suppliers wanting to cover their backsides.
But Sprint has already shown the path to salvation for the corporate greed part.
Sadly that hasn't caught on.
I keep hearing that we're such a small minority of users.
Seems to me we're big enough to dominate the industry blogs, and get a lot policies and laws passed concerning us.