But the circumstances there make it different from a lot of AI voice work since in her case there could be no claim that sounding like her was a coincidence since Ford had an impersonator sing one of her songs (which they did properly secure copyright to use).
What they *might* be is protected by other laws. The closest case the US has seen is this Bette Midler one: https://en.m.wikipedia.org/wiki/Midler_v._Ford_Motor_Co.
But the circumstances there make it different from a lot of AI voice work since in her case there could be no claim that sounding like her was a coincidence since Ford had an impersonator sing one of her songs (which they did properly secure copyright to use).