The story
Almost certainly patterned after in Minecraft, not least because of the similarities and comparisons made between the game Minecraft and the game platform Roblox.
Etymology from Wiktionary, CC BY-SA 4.0.
in Roblox
Today it means: Used to supposedly keep oneself from becoming legally liable for making a certain statement that could be perceived as a threat, or that may otherwise pose a legal risk. Full definition →