This is a valuable lesson for any manufacturer: never awaken the nerd sleeping inside your customer, because his wrath shall be terrible.
In this case the warning was quite literal.
The company annoyed a buyer enough to push him into full blown nerd mode. He tore the product apart, reverse engineered every part, and then published a step by step guide showing exactly how to disable "kill switch" that prevented the use of the product without the vendor spying on the user.
What started as a minor grievance became a public, technical exposé that left the maker exposed and embarrassed.
Moral of the story: underestimate your users at your own peril.