What about that time they locked up peoples' cameras as an April Fool's prank?
Magic Lantern is being slammed online after pulling an "unfunny" April Fool's Day prank that gave DSLR owners a fake "Blue Screen of Death." The message
petapixel.com
That's interesting. Didn't know about that. It is not actually locked up, though. It seems to be a poor joke, checking the camera's date. It has been removed in March 2017.
Magic Lantern is subject to a lot of changes made by different people. And there is a fork which does indeed modify settings in the camera (Which goes against the ML policies, hence the own project fork). Still, ML just gives you access to options and implements a good amount of functionality in top of that. It is clearly a solution for people not adverse to tinkering. I would not consider it nefarious at all.
But I'm pretty sure it is a thing of the past anyway. It certainly won't come to the R5. Earlier Digic iterations already proved to add too much complexity, I would think Digic X is another leap in that regard.
As for the topic: I don't think the sensor is the component responsible for the heat. But I agree it would be interesting to see some measurements comparing the temperature of the back, bottom and sensor, just to see how evenly it is dissipated.