It depends on your generation and use cases. For example, Amazon in India (not sure about US or any other country) is now using AI images on their website for advertising. Earlier, they used to hire models or influencers, but now they using AI models.

Don't get me wrong, maybe actors, or celebs might still be used to promote, let's say a new flagship phone but or base phones, where the margin of profit is minimal, organisations would leverage AI for the promotion.