> I don’t think this is necessarily what is happening.

This is exactly what happened with my niece, my nephew, and all of their friends.

Which isn't to say they've outgrown all of the games they played when they were younger. They still play minecraft, stardew valley, kirby, mario, etc. I don't know why, but they all bounced off of Fortnite after they hit a certain age. I wonder why.