This was the most generic looking game ever created, even surpassing Derek Smart and artwork used in his games.
It's nice to have some free assets but they are bland as they get and them being free will sprout many generic looking games using those equally generic assets. Like those horrible Unity first person early access games which use free or stolen assets.
They are giving it away because:
a) they have no use of it anymore
b) it will help spread usage of Unreal engine
So in the end it is business move, not so nice of them thing. No such as nice of them in business. You give to the poor, you get tax deduction.