There is some kind of continuing relationship between the two: Weta FX will keep contributing assets to Weta Digital's (i.e. Unity's) asset library. Maybe that

There is some kind of continuing relationship between the two: Weta FX will keep contributing assets to Weta Digital's (i.e. Unity's) asset library. Maybe that's in exchange for being able to continue to use the software? I haven't seen the deal spelled out anywhere. From the Unity blog post [1]: "Another exciting element of this acquisition is the asset library we’ll inherit from Weta Digital, which includes urban and natural environments, flora and fauna, humans, man-made objects, materials, textures, and more. The WetaFX team will continue their industry-leading VFX work for major film and TV productions and feed into this asset library for years to come." [1] https://blog.unity.com/news/welcome-weta-digital https://blog.unity.com/news/welcome-weta-digital