Pretty silly - the sewage treatment company could use willows if they worked in bulk. Instead they use settling and digestors. Still open-air in our town. Sludge is used as landfill and sometimes fertilizer/soil amendment. What's the difference?
I remember listening to a special segment on the AMC cable channel about "unofficial" film archivists who were willing to break the copyright law to preserve old films. A lot of them ended up getting hired officially to continue to do their work once the movie studios found out they could make money on old films (vhs/reruns/etc).