Well worse than that, Oracle closed sourced ZFS, so OpenZFS was forced to become a fork, and they are no longer compatible with each other.
As for GPL the CDDL license that ZFS uses made sure that code contributions attribute copyright to the project owners, which means they can change the license as they please without having to track down contributors.
You would think with their investments in Oracle Linux and btrfs they would welcome that license change, but apparently they need excuses to keep putting money into Solaris, and their Oracle ZFS appliances instead.
It hasn't had a meaningful update in ~10 years, and the problem is it still has the brand recognition which keeps potential users away from LibreOffice. It's an embarrassment to Apache if you ask me.
One of the common problems plaguing Apache is that a lot of their software rots on the vine for official support. OpenOffice is one of them, and it came into ASF like that, because the Oracle buyout caused a lot of Sun projects to wither. See also: Solaris and MySQL, which had very public forks.