The current laws surrounding video games are naive and are akin to letting minors into casinos in vegas as long as the casinos put a couple of cute teddies here and there.
Yes Roblox looks like a game for kids, but it doesn't play like one, it's not even trying to hide the obvious gambling aspects, but because it's done using "funny tokens" suddenly kids of any ages are welcomed in with open arms.
And that's just one shady aspect of the game, then there's the child labor practices and the whole pedofile scandal.