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Marketers would call your car commuter segment an "occasion." Perhaps more than finding new demographic segments (age/race/income/etc), food bev & QSR look for novel "occasions" like car snack, desk grazing, pre/post-workout, airport indulgence, social apertif, etc to drive sales growth

(One might also think of "functional foods," "mood boosters" etc which are neither an occasion nor a demographic. Perhaps these in particular are closer to a true JTBD)

How is "car commuters" a demographic segment?

Does the word "demography" mean anything?

Is "people who like to buy milkshakes" a demographic segment too?

Good segmentation is mostly not by demography nowadays. At best, demographics are a correlative element to something more fundamental, usually economic, behavioural or psychographic.

> Clay Christensen is smart

Not anymore. He died in 2020.