Boyd is correct, JBenson now lets you download his gpx tracks. I do the same with all of my maps, but our maps are maps of tracks so it is easy to do if you are willing to give your tracks away. I didn't bulldoze any of my trails/tracks, I just map them so I figure they are everybody's trails/tracks.
Also by letting people have your gpx tracks they can use them on Android devices. People who sell maps of tracks will not give their tracks out. But in my hobby everyone is quickly converting to Android and IOS since you can get huge tablets refurbed or new for a hundred bucks, much cheaper and better than a $500 Garmin or Lowrance.