Just imagine how easy it's going to be to screw over other websites, just by making an account, uploading material that could in some way be construed as violating copyright but passes the filter because it cannot be perfect, and then reporting the site to one of the bodies responsible for upholding this directive.
Hell, just by doing that you could probably end any potential upholding of this system really fast.
Hell, just by doing that you could probably end any potential upholding of this system really fast.