A marvelous analogy from a blogger, Tenn, who presents an entire symposium on the suject at the link above:
“The best analogy to sum it up is the difference between homeschooling and public school at home to me is the difference between working at home for a company and owning your own home based business. While both may be done at the same location – the location does not make everything about them the same. If I own my own business I call the shots, I am fully responsible and accountable for my actions. In short I am in control. If on the other hand I work from home for a company – I simply control the location I am in – I am still accountable to the office, they own my work and they make my assignments and decide if I do them well or not. In short, they are in control and I simply gain the freedom of being in my own home.
“To conflate the two concepts of telecommuting (working at home) and owning your own home based business would have serious legal implications and therefore the two are kept distinct and separate. The same must be true for the distinction between homeschooling and participating in a public school program in your home. If you do not wish to see the laws and standards of public schooling foisted upon home educators then be sure the two concepts do not become conflated. We can not allow the two concepts to be merged into one or the laws will become muddled and confusing. Keep homeschooling and public school in the homes separate as they should be.”