“Just install Linux on it” is the “just change the engine of your car” of tech.
Not everyone is a mechanic, not everyone wants to be a mechanic, and, if we want a world where freedom is the norm, we must stop expecting everyone to become a mechanic.
Note: this is not because these people are too dumb to be mechanics. It’s because they’re brain surgeons and space-shuttle pilots and they have three kids and they care for a loved one and they don’t have time to also be a mechanic.