I remember all this too. The time period that I was in this scene was AFTER 2010 though so who knows. As mentioned in response to the sibling "credible sources" bro, I was just a lowly support engineer so i had to trust that the CEO wasn't lying to us about all this.
Maybe he was ... they do that sometimes.
I looked around a little. the C&D from Netapp was in ~July 2010 and the partnership and product with Oracle in the Fall (Around the cease fire) and we continued with that (via the Oracle Partnership) through 2011-2015 when the company ran out of cash and laid us all off.
* https://www.theregister.com/off-prem/2010/09/09/oracle-and-n...
* https://www.computerworld.com/article/1585889/opinion-patent...
NetApp originally sued then-independent Sun in 2007, and Sun counter-sued.
Free/TrueNAS/iXsystems has been offering ZFS-based solutions for many years now, and I haven't heard NetApp going after them:
* https://en.wikipedia.org/wiki/TrueNAS
* https://en.wikipedia.org/wiki/IXsystems