I'll go for Roblox myths because, There is more than one Myth in roblox, plus all of them have storys, Herobrine is Unknown and is considered rather, Notch's dead brother, rage from fired employee or a ghost, I consider it as Fake because you can only encounter Herobrine by a Mod.
Do not take this seriously, this is just my opinion, I play Roblox everyday and I don't like Fortnite, if your wondering, my Roblox username is: GreenLiciouss