That it is copied or soundalike does not matter. There are preceding legal cases against using impersonators in commercials that would apply here. It has happen

That it is copied or soundalike does not matter. There are preceding legal cases against using impersonators in commercials that would apply here. It has happened to Tom Waits twice, and both times he sued and won: https://www.youtube.com/watch?v=H6y1kc8Equk https://www.youtube.com/watch?v=H6y1kc8Equk The point is that Geerling is doing Youtube videos in the same field as the products this company is using his voice for. That makes it appear as if Geerling would be endorsing their products. If his voice had been used for, say, a nature documentary then people wouldn't have made the connection that it would have been him.