More egregiously, they're (per your article) manipulating kids into buying real ads for their creations, with the false promise that "you could get rich -- if you pay us".

>"As there are no discoverability tools, users are only able to see a tiny selection of the millions of experiences available. One of the ways boost to discoverability is to pay to advertise on the platform using its virtual currency, Robux."

(Note that this "virtual" currency is real money, bidirectionally exchangeable with USD).

The sales pitch is "get rich fast":

>"Under the platform’s ‘Create’ tab, it sells the idea that users can “make anything”, “reach millions of players”, and “earn serious cash”, while its official tutorials and support website both “assume” they are looking for help with monetisation."

I agree that this doesn't really look like a labor issue. That's distracting and contentious tangent; it's easier to just label this as a kind of consumer exploitation. (Most of the people involved aren't earning money -- but they are all paying money). It's a scam either way.