Canon makes its own sensors. They’re the only major player not using Sony sensors.
Sony and Samsung are both producing a lot of sensors for mobile devices though. For example Apple has used a lot of Sony sensors over time. And likewise most camera manufacturers do not design their own sensors at this point.
(and once Sony makes the money, it uses the same profits from Fuji to compete against Fuji.)
It's a sort of reverse competition, where by Sony is guaranteed victory simply because they participate in their competitor's victories.