Various #startup corporations lit upon this one-shot winning idea, this "killer app" (they're still obsessed with the "killer app" in the #tech sector, cf. Elon Musk's obsession with making X the "all in one" website) because it's just so feckin' cheap.
It's the ideal technology sector gimmick, just the thing that gets all the #investment types excited: a device whose manufacturing cost per unit is negligible, but which generates a gigantic quantity of ever-accruing profits through subscription fees etc.