They have several niches where the alternatives are more expensive and worse. Half the RVers in any park have it now. RVing teaches you how much of the country is not covered by cell signal. Boats.

Another one I know first hand: food trucks. I do several events a year where cell signals get overwhelmed and cease to function, but I still have to process my credit cards. I’d say a solid 25% of food trucks are running these now.