What has roblox "copied" exactly?
All of your precious hats are rip-offs of other games. As well as plenty of other stuff.
But what OP is saying is that the old version of Blockland was copying lego because he just dislikes the game and likes to complain.
Hats aren't exactly a feature of the game...
They've technically copied other things but i will not even try to get into that.
ROBLOX and Blockland are both based on a virtual version of LEGO.
However, Blockland focuses on more community building (correct me if i'm wrong) and ROBLOX focuses on a game creator and scripting.