No, your not the only one. There are many users that dont think about this, and the wide spread ability of WinMX.
Many users dont seem to realize how far files travel to other users here, I myself and many I know go through a process before sharing files
We listen or watch them to verify they are the correct file, reaname them if required, and use the MP3 Tag Tool to make sure they are clean tags with no identifying marks of where they came from originally, scan them with virus protection and then..... share them.
Sounds complicated but hey people it only takes me all of five minutes to make sure the files I am sharing are the files you want, cleaned and ready to pass along...If more of us did this it might only take two minutes.. lol