Reviewing these files would be more work for LL (and so they will not be a fan of your suggestion), and would take up their bandwidth and storage to boot. If you can be bothered to do all that, including sending the file, then why not just send a DMCA takedown notice?
How would this work technically? Would the button click prompt the clicker to send the file or would they have to wait for someone at LL to tell them to send the file, introducing a delay that would likely make action take longer than just sending a DMCA take down notice?
Why not just send a DMCA take down notice?