OpenAI's mistake was caving to SJ. They should have kept Sky and told SJ to get lost. If SJ sued, they could simply prove another voice actor was used and make the legitimate argument that SJ doesn't have a monopoly on voices similar to hers.
That's assuming they did, right now they're asking us to pretty please trust them that their girlfriend from Canada is really real! She's real, you guys! No I can't show her to you.