This isn't outright copying a game. It's a modified version of Divinity.
And I'm just saying, you're making a fuss over nothing.
:P
But Thread and Project title are Diablo 2, he's replicating the orginal game as much as he can. But sure let's turn a blind eye and say it's not diablo 2 lol.
The title says "Diablo 2 Map Mod"
MAP MOD.
He's not advertising nor trying to claim that this is a full duplicate game of Diablo 2. The word "mod" signifies that.
It's a mod, made from divinity.
Who cares? Go tell Blizzard if you really want to...