We're building a product that provides a web interface for creating videos that users can share as stories on social platforms. This includes applying transitions and effects to input images/videos, and generating a resulting video.
Maybe we could be using ffmpeg for this. We never really explored that in depth since OpenShot seemed like an obvious solution :P
Futhark is an offer for people that need high performance code, but could spend their time on better things than writing CUDA/OpenCL code by hand.
Clearly that's not everyone. Maybe you don't need high performance code. Maybe you need to squeeze every last bit of performance out of your GPUs, so you actually need to spend time writing your own CUDA/OpenCL code.
So while it might not be worth it for you, it might be worth it for people trying to solve other kinds of problems :)