Just a few thoughts.
Well I think some people download files with no names at all and guess at the artist (sometimes way out) or title or whatever and it's a genuine mistake. If those that download them don't realise or even don't bother to correct it then that's another wrongly named one on the network! Some I think also try to disguise what they are sharing (you never know who is watching).
If you download something with the wrong name and don't delete it, please remember to change it and if you have a poor file - add "dud" or "broken" to the name so the rest of us don't get it (he says after several attempts to download something and every one has the same fault in the same place - all clones of each other).