>>11830727 George Lois, the advertisement dude who made a lot of the Esquire covers, Nickelodeon logo etc etc had whole stint of using athletes to promote things by presenting them in a way they aren't usually seen - like crying like kids for "I want my Maypo" ad.
One would still be dragged to court if they started putting some famous person on the ads of something they aren't getting money out of or have given permission for. That's a whole deal with legality of licensing the likeness of someone.
AI can generate you one, it's technically free to use as the AI can't own the work but it's still based on the likeness of someone with rights to it. - On the flipside, a photograph is generally the property of the one taking the picture, so it would go to courts and you could lose big just in expenses for a settlement.