Karen Sandler, Executive Director of the Software Freedom Conservancy, has an enlarged heart (hypertrophic cardiomyopathy) and is at risk of suddenly dying (due to a medical condition called "sudden death"). She has no symptoms. She has given a talk about this many times at tech conferences, you should be able to find a copy of her talk online quite easily. She calls herself a "cyborg lawyer running on proprietary software" because she needs to wear a pacemaker/defibrillator device on her heart which keeps her heart beating within a predetermined acceptable range (not too slow, not too fast) by shocking her heart until it beats at an acceptable rhythm. Sandler said she's been shocked before and it's like being kicked in the chest and it takes the wind out of her for a while, requiring her to take some time for recovery.
She knew of software freedom and figured on these weaknesses in these devices, some of which can be controlled remotely at some distance, because all of them run on proprietary software. She tried to get the source code, even offering to sign a non-disclosure agreement to do so, and nobody would share the code with her. She said she was the only one to ask her doctors about what ran on the device. She therefore chose an older model which requires the "programmer" device which sends a signal to the pacemaker/defibrillator be quite close to her body so that she'd probably know if someone were doing things to her device. The lack of software freedom and full user control (ownership) of the device is quite obviously a health risk and possibly lethal. Don't let anyone tell you a lack of software freedom isn't serious.
An interesting thing happened during her pregnancy, which she explained in an update to her talk: She learned that a pregnant woman's heart sometimes naturally races. For most women of childbearing age this isn't a problem as they're unlikely to need a pacemaker/defibrillator, so their heart can occasionally race without serious consequences. For Sandler this racing triggers the device to shock her back into an "acceptable" heart rhythm. It appears that the pacemaker/defibrillator device makers didn't test this device on women young enough to be of childbearing age but they're apparently happy to sell the devices for implanting into users of any age. This lack of testing in combination with the lack of software freedom means the device manufacturers aren't doing due diligence and they're preventing younger women, such as Sandler, from looking out for their own interests—avoiding "sudden death". One can only imagine what horrible multiply lethal outcome could predictably result for a pregnant woman with the same condition Sandler has whose heart races when she was driving while receiving a shock from her non-free pacemaker/defibrillator device. Don't let anyone tell you a lack of software freedom isn't serious.