eah it's insane and there are actually multiple stories like that. Let me put the real ones in front of you:
Real Examples of Young Roblox Devs Getting Rich
Alex Balfanz — Jailbreak
Made Jailbreak during his senior year of high school with a friend, built after school and in spare time. Hit 60,000 concurrent players on day one and eventually topped 150,000. Made enough to pay for all four years at Duke University — over $300,000 — in just a couple of months. DevEx Calculator
Gigi — Dress to I