Like YouTube, Roblox started as an online stage for young creators. As the company grows toward 100 million active daily users, contributors are making big money selling games.

Roblox modernizes game ownership rules, and teenage developers are cashing in on their creations, earning millions while still in school.

Much like Minecraft and Fortnite, Roblox thrives on community-driven creativity, but it does so on an even larger scale. Teens have become millionaires through their Roblox creations.

The creator of Blue Lock: Rivals thought kids on Roblox might like a soccer video game with an anime vibe. It sold a few months later for more than $3 million. The 19-year-old, who asked that his ...