If memory serves me right, this was added after someone traced down their stolen laptop because the SETI@home screen saver was running on the stolen machine.

Edit: I think this was the story: https://www.engadget.com/2007/02/22/seti-home-claims-its-fir...

Edit2: Here is an interesting thread related to the link above: https://setiathome.berkeley.edu/forum_thread.php?id=36985