"with many photographers on Flickr, who said they never intended their works to printed and sold in this way." Why the backlash? Blogs never intended to have

"with many photographers on Flickr, who said they never intended their works to printed and sold in this way." Why the backlash? Blogs never intended to have their ads blocked, yet it happens. Musicians never intended to have their music shared for free, yet it happens. Movie producers never intended to have their movies given out for free. Yet it happens. Software developers never intended to have their software pirated. Yet it happens. I would be curious to see how many of the photographers that complained have a legitimate version of Photoshop on their computer. My guess is very few.