> and they're the party who can claim to be aggrieved, if it violates some duty Automattic has to WPF
Tortious interference - where one party (Automattic) interferes with a contractual relationship between two parties (WPengine, their customers), in this case by means of disparagement pushed to the dashboard of WPengine instances.
Inducement? Like "We have blocked the ability to access plugin and other repositories for customers of WPEngine. We have not done so for this other, "independent", for-profit entity (that just so happens to be owned by the same person)"?