It's actually the other way around. The finger cools the CPU down.When Mcllrn touches the processor with a bare finger, the temperature rises.
As I’m touching the CPU, its temperature drops, I’m detecting those drops and registering it as a “button press” which changes the color of the font on the screen
As long as you only touch the heat sink it should be safe, I mean we slap big chunks of metal on there, if it would let electricity through we would have a very bad time with CPUs in general.Comes winter and this could easily become a fry-my-Pi-with-static-electricity button.
Intriguing, but do use caution.