I think a big problem with open source games is in the vfx side of things where the work that needs to be done is long and arduous, it needs to have a coherent

I think a big problem with open source games is in the vfx side of things where the work that needs to be done is long and arduous, it needs to have a coherent visual language and gfx artists just don't seem very interested in doing that. Plus for a lot of gaming platforms that are relevant you have licensing fees etc which are big blocker for FOSS projects.