The difference, at least from my perspective as a viewer, is an advert that used someone impersonating a celebrity would need to be marked as such. If an advert

The difference, at least from my perspective as a viewer, is an advert that used someone impersonating a celebrity would need to be marked as such. If an advertiser used a celebrity impersonator in order to make people think the celebrity endorsed, or was at least willing to be associated with, the brand that would be grounds for the celebrity to sue, and for the advertising regulator to fine the brand. By recreating a voice in AI the company is effectively doing the same thing - associating that celebrity with their brand without permission. That's reasonable grounds for the celebrity to use the court system to say "That's not me, and I want to be paid for the damage this association may have caused to my status."