Did you not read what I said? It doesn't matter whether it's a fork or not. If Oracle wins the current lawsuit over Java, it's arguable they could go after OpenZFS too as the lawsuit is based on whether the design of software (not the implementation, the design) can be owned by a company.
"The appeals court reversed the district court on the central issue, holding that the "structure, sequence and organization" of an API was copyrightable."
Java and illumos are licensed under two completely different licenses, and neither illumos code base, nor OpenZFS are an application programming interface.
