A lot of that is out of band’s hands. Ticketmaster has, essentially, a monopoly on venues. It’s already incredibly hard to even make net zero on playing shows, getting picky about venues makes that almost impossible and relegates your band to shitty dive bars.
Its not necessarily a kid’s game, but that is their primary demographic and player base out of some fusion of being easy to run, simple games being easier to create, the art style, the accessibility and short term gratification of easily jumping between experiences.