That does not seem like a bad business decision to me. Actuators are used often in rocketry, and SpaceX obtained the necessary know-how to build them in-house f

That does not seem like a bad business decision to me. Actuators are used often in rocketry, and SpaceX obtained the necessary know-how to build them in-house for a cost of mere 9 man-months. One fewer external dependency. Starship gimbals its Raptors electrically as well. Those actuators aren't probably identical to the Falcon 1 ones, but I would guess that there is a lot of inherited knowledge in them.