I feel like that's a little different. In the cases of Midler, Waits, and Johansson, the companies involved wanted to use their voices, were turned down, and then went with an imitator to make it seem to the audience that the celebrity was actually performing. In the case of this "Morgan Freeman" video, Freeman himself is very obviously not performing: the imitator appears on screen, so it's explicitly acknowledged in the ad.

But I'm not a lawyer of any sort either, so... ::shrug::