From the WD40 website:
While the "W-D" in WD-40 stands for Water Displacement, WD-40 Multi-Use Product is a unique, special blend of lubricants. The product's formulation also contains anti-corrosion agents and ingredients for penetration, water displacement and soil removal.
If no other lube was available I have no problem using WD short term.
Pro bike riders, as in current and former Tour de France etc etc, use it on their bike chains/chainrings/gear clusters, to keep the beach sand to a minimum when training in South Florida.
Rem and Hoppe's oil used on firearms.
I have washed away sawdust with WD40 after filing/carving/sanding stocks to final shape and then oiled properly.
Need to remember to always keep the Scuba tanks full now that I'm retired.
Dive shop buddy set them up (regulators etc) for airbrushing, tire filling and other chores on boats/home.
Airbrush compressor and a brush works kinda okay.