The author, a type 1 diabetic, discovered that their insulin pump controller uses the Linux kernel and violates the GPL by not providing the kernel source code. The author tried to contact the manufacturer, Insulet, and the hardware supplier, Nuu, but was unable to obtain the source code. The device's use of an ancient Linux kernel and lack of security measures is a concern. The author is seeking to raise awareness about the GPL violation and the potential security risks.