Why was the background music removed from Homepage DD1US?

Homepage DD1US
The background music had been missing since… like 2006.
Matthias Bopp removed the background music because was afraid he might get in trouble due to missing rights. He has not been granted rights by Gesellschaft für musikalische Aufführungs- und mechanische Vervielfältigungsrechte(GEMA). He was not sure whether the MIDI files were free of such rights. He did not want to apply for those rights. He heard that other sites were being sued for using music without rights, so he removed the background music so that he wouldn’t get in trouble like those sites did.