Ask HN: Concrete examples of honest people with anything to fear from the GPL

GPL-related debates seem to be rather short on actual examples of anyone who has anything to fear from the license, who wasn't already doing something obviously questionable (see this for an example: http://news.ycombinator.org/item?id=610764) Would anyone care to provide some?

Edit: "My customers/managers/colleagues fear the GPL" is not a valid criticism. Anything with a similar amount of well-funded FUD thrown at it will be similarly feared.