Yes, that would be the 10% of the problem that can't easily be fixed. With my solution though, the file sharing companies can easily claim ignorance and search engines aren't linking to the files.

1. User uploads file all_nintendo_roms.zip
2. User is allowed to make NO COMMENTS about file.
3. File sharing site changes file name to XjyrtGSdfrtd_fgre.zip
4. File sharing site tell user the file is now been changed to XjyrtGSdfrtd_fgre.zip and gives link to file.
5. When people use file sharing search engines and search for nintendo roms, THEY DON"T FIND all_nintendo_roms.zip nor do they get assistance by comments about the file.

Of course, file sharing sites would be hurt if files weren't named after what people are trying to get for free. This is an obvious change though that would solve 90% of the problem.