Call them what they are, don't be shy about it.
Yep, super low overhead and maintenance and so long as your art is nice and your bs ad catches eyes you guaranteed to print money for a bit.Mobile games is any easy come up in this day in age. All you need is enough cap for development and 1 of service before you ghost your customers. Then outsource a skeleton crew to maintain the app. With enough subs, a Chinese or Korean company will buy the app up and push it heavy in Asia. By that time, you'll be in another project.