Am I one of the only people that notices that LoL is a rip-off of warcraft?

As a little kid I always used to play warcraft, and a few weeks ago I see a guy playing what looked like warcraft. I ask him about it and he's like nawwww m8 this is LoL. How did they get away with making a game so similar?

EDIT: Oh fuck ok lol didn't know that nvm.