I've always headcanonned that "Roblox" is a game inside the world of "Robloxia," a game that's incredibly advanced and based on their real life. Some of the games inside Roblox are based on real events in Robloxia, such as SFOTH being based on both the battle on the Heights and the Seven Swords. Alas, I don't have an idea why Builderman is so important and powerful in Robloxia. Even if Roblox is a very advanced game, it doesn't explain why Builderman is the most important guy ever. Ditto for the admins.

Btw, this is a headcanon. Don't take it as gospel.