Hello! Are you okay? I have a fanpage on anime. I have a session wallpapers and found its super cool! Can I put your wallpaper on my fanpage link to your deviantART? Congratulations on the job! It was great!
Ebay's copyright/trademark infringement is rather convulted and involves contacting and disputing only valid claims of copyright.
Since I do not own Death Note, its characters, or claim any copyright and provide this file free to use, they're using it. They may be in the wrong, but proving that I have any claim to take down their item is a long process and doesn't guarantee that I will be in the right since I don't own the copyright.