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This fad started to mimic Aircraft types being filled with Nitrogen.
Aircraft tyres filled with nitrogen because a compressed air mixture may cause a wheel fire when (if) the tyre slips against the hub causing high temperature friction fire. This has happened and why Aircraft tyres have slip markers on the tyre/rim and fuse-able plugs. Thus also the introduction & use of nitrogen gas to fill the tyres and also because most flight lines have a portable nitrogen rig available.
Motor vehicle tyres cannot get to the same pressures and loads of aircraft tyres and it is not needed and it is a gimmick for business to make a buck!
Don't get taken...as said air is 78% nitrogen so if you pay for nitrogen in your tires ask for 22% nitrogen and have them fill the rest of nitrogen (78%) from the free air.
edit:
most nitrogen available from "tyre places" is not high purity nitrogen (probably 96% purity) and indeed this is not moisture reduced so it does contain some moisture.
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