Don’t try to understand it using grownup logic Greg. The app works fine. Multiple people can make versions of the same game. Think of the games more like function rooms where a few of them throw the same sort of themed party but the one that does it best will have more people passing through. You can see the stats. The kids either know what they want, explore for fun, use favorites or the join feature to go right to wherever a friend is.
When my 7 year old isn’t playing she is watching YouTube videos about playing (been cutting her off a bit actually). The other day I saw her watching a video and following along to build a creative house in a “bloxburg”. Pretty neat. She has also learned computer skills playing on a 2011 MacBook Pro we still have. We got her a mouse for xmas.
Regarding Apple’s cut, I’m not sure how much they take. I know all our holiday gift cards were done direct through the website. Not an in-app purchase.