1. Those that shouldn't be homeschooling because they are not trained as educators, certainly not in all of the subjects they need to teach, but they are religiously conservative to the point of some social withdrawal, and don't want their kids going to public school and being exposed to drugs and liberalism. I've known many people in this category. BTW- I'm somewhat conservative and religious, so when I say they are conservative and religious, I mean really conservative and religious.
2. Those that are so liberal they take their kid on a round the world trip spending all of their life's savings and money from their newly-sold house to do so, homeschooling (some would say no-schooling or light-schooling) during the trip with little support or structure. When they got back they got a lower-paying job and started from ground-zero again, with their kid who disliked the trip and missed months of education. I only know one person in this category.
I have never been introduced to a no-speed-limit homeschooler.