Because the judge's contention is that the "gurus" of the individual sovereignty movements invariably sell their services to the unsuspecting masses, hence it is a commercial endeavor and not the high-minded social reform it is styled as.
That was how I understood the term. These organized psudolegal arguments are commercial in nature because they come from outside commercial sources. Rarely do they come from the person's own ideas or research. They are typically pre-prepared documents sold or given out by someone who is in it for their own gain. This was my undrestanding of the term commercial.