> Ford Motor created an ad campaign for the Mercury Sable that specifically was meant to inspire nostalgic sentiments through the use of famous songs from the 1970s sung by their original artists. When the original artists refused to accept, impersonators were used to sing the original songs for the commercials. Midler was asked to sing a famous song of hers for the commercial and refused. Subsequently, the company hired a voice-impersonator of Midler and carried on with using the song for the commercial, since it had been approved by the copyright-holder. [1]
If you ask an artist to sing a famous song of hers, she says no, and you get someone else to impersonate her, that gets you in hot water.
If you (perhaps because you are savvy) go to some unknown voice actress, have her record a voice for your chatbot, later go to a famous actress known for one time playing a chatbot in a movie, and are declined, you are in a much better position. The tweet is still a thorn in OA's side, of course, but that's not likely to be determinative IMO (IAAL).