As soon as Scarlett Johansson said "no" (which I assume is true), OpenAI needed to go in very different directions to avoid anything that might look bad. It doesn't matter if they used a sound-alike or built a model from actual source material; anything would look bad. It looks especially bad when the company insists chatbot outputs are synthesized and not copyright infringement.
"Looking bad" is not illegal. If OpenAI didn't do anything illegal, saying it shouldn't do something because it might "look bad" is unfounded. In general, listening to what people say and avoiding things that might "look bad" to someone is a bad life strategy.
It is a bad life strategy as an individual to worry too much about the judgement of others.
But marketing and PR are important parts of running a business. It may be annoying that your customers care about things that you see as silly PR stuff, but it still matters to the business.