Millions of children have flocked to the online gaming site Roblox since March. That’s helping game developers, some as young as 16, make a lot of money. Garvey Mortley, 12, with her mother, Amber ...

Video games are fast becoming big new music venues: Roblox, the popular virtual-world game platform, is following in the footsteps of “Fortnite” to tap artists for performances and special events. Pop ...