Modern Bike Repair Etiquette

I'm not sure, but would this happen in other places? Here is a photo of a stripped down bike frame I saw downtown, and the note taped to it.

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The bike location on Front St:

The note:

The note reads:

Looks like you're done w/ this bike so I removed the back wheel + rear derailur (sp?) to use on another bike in need. If you want these parts back, just call... 970-379-4676. [peace sign] [exclamation point]

For what it's worth, 970 Area Code is in Denver.