ZFS is a big business
Oracle: "ZFS is currently one of the fastest growing products within the Oracle Server and Storage Systems business unit and sold more than a billion dollars". As far as I see, this is not a discussion about if GPL and CDDL are compatible. I think it could refer to Oracle’s own cloud. Did you know that Oracle has a massive global storage business? Did you know that Oracle has over three hundred petabytes of ZFS Storage Appliances deployed across its cloud, infrastructure hosting, internal product development and global IT operations?