My guess is they want to move much faster in some areas, in particular VR/AR, so that competition (mainly Unreal Engine) doesn't capture the market. That requir

My guess is they want to move much faster in some areas, in particular VR/AR, so that competition (mainly Unreal Engine) doesn't capture the market. That requires more investment than they can currently afford. Unreal Engine is better in some aspects, but Unity has a very active community.