It's deeper than that. Ellison and Jobs were best friends (to the point that they could be seen in public occasionally wearing matching best friends tshirts).

Jobs died thinking that Android (and particularly Eric Schmidt's part in sitting on the Apple board while Android was being cooked up at Google) was a personal affront to his magnum opus of iPhone, and the rumor is that Ellison agreed to hurt Android any way he could more or less without regard for the costs.