I imagine there are tons of office workers, mechanics, construction workers, etc. who are drinking instant because it’s impractical or impossible to have a coffee machine at work or in the field. I believe the vast majority of coffee vending machines also use instant coffee behind the scenes, so everyone who’s ever gotten a cup of highway rest stop coffee was most likely drinking instant at least once. Ditto with the “cappuccino” machines at every convenience store and gas station on earth.
I carry instant coffee with me when I’m camping, because I can’t be bothered to have to carry and more importantly clean any kind of coffee gadget.