Thinking of the kids again, there's some elaborate mobile dress up game called Love Nikki Fashion Queen or something Engrishy like that. It has some vague RPG elements and it was something that would pop up a lot on those lists for phone games that don't absolutely require you to spend money to progress.
I kept it installed for few weeks and there were pretty regular events and these lighthearted completely nonsensical scenarios where every form of conflict in the kingdom was resolved with a fashion duel.
Seemed like more was possible than just the story campaign though, they had daily freebies and weekly themed outfit contests with voting and things, and some kind of guild system. Some people seemed into it to an unhealthy degree.
But as you can see by the wiki,
when I say elaborate, I'm not kidding.
Of course this could easily turn into another free game/mobile game thread, but I feel like certain ones just deserve the title of 'timewaster' more. The kind you look back on on your deathbed and regret.