Comment by npinsker

It's not pretending to be FOSS. Like other engines, you need to pay them if you make money.

But no advantage seems like a stretch? (or at least, in future, might be a stretch) They're aiming for a superior workflow for small games (e.g. making stylized rendering way easier for non-technical devs). Also their pricing is 10% of Unity's, which is itself around 10% of Unreal's.