These contributors are "partners" under the common meaning of the word right? After all the tweet [1] that Matt links to from his own blog post [2] says
> We are committed to working with Joost, Karim, and other respected voices in the community to ensure WordPress’s future is stronger than ever.
That sounds like a partnership to me.
[0] https://storage.courtlistener.com/recap/gov.uscourts.cand.43...