Unauthorized Bread: Jailbreaking IoT toasters
I programmed for a refurbishing company for some time, where I learned about toner cartridge refill kits.  Once you've bought an expensive copier for your company you're vendor locked into proprietary toner cartridges, and they charge outrageous prices.  "Pirates" started selling bags of toner and syringes on eBay with instructional videos on how to refill the cartridge yourself.  The toner company started putting small chips on the cartridge that would count the number of prints, and deactivate the cartridge after a certain amount.  "Out of toner" was a lie, it was unauthorized printing.  Reading this story is making me sick to my stomach.