Roblox's pitch to young developers is one of the most effective in the industry: build something, put it in front of hundreds of millions of people, get paid. All three parts are true. The third one is true for far fewer people than the pitch implies.
The conversion problem
Players buy Robux at retail. Creators earn Robux from purchases inside their experiences. Creators then convert Robux back to currency through the Developer Exchange programme — at a rate substantially below what players paid to acquire the same Robux, after Roblox's platform share.
That spread is the business. It is not hidden, it is documented, and it is defensible in the sense that running the platform costs money. It is also considerably wider than the equivalent take on Steam, the App Store or Epic's own creator programme, and it applies to a creator base that is disproportionately young and unlikely to be reading the terms carefully.
The distribution is the real story
Even setting the rate aside, the earnings curve is a power law of remarkable steepness. A small number of studios at the top run genuine businesses with staff, offices and multi-million-dollar annual revenue. Below them is a thin middle class. Below that, the overwhelming majority of creators earn amounts that do not reach the payout threshold at all, meaning they earn nothing they can actually withdraw.
This is not unique to Roblox — every open marketplace looks like this, from the App Store to YouTube. What is different is the age of the participants and the framing. Roblox markets creation to children as a route to income, and the median outcome of that route is unpaid labour producing content that increases the platform's engagement metrics.
What would change it
A higher exchange rate would be the direct fix and the least likely one. A lower payout threshold would let more small creators withdraw something. Clearer, mandatory disclosure of median earnings — the way franchise operators are required to disclose in some jurisdictions — would at least let a fifteen-year-old make an informed decision about how to spend their summer.
Roblox has improved its creator tooling substantially, and the top end of the platform is now producing work that stands comparison with commercial studios. Both things are true: it is the best on-ramp into game development that has ever existed, and its economics are structured so that almost everyone who takes it works for free.