It's probable (and logical) that voices will be treated similar to physical likenesses. You can't use a photo of Elvis without permission (there are exceptions) and so...you can't use his voice. Am not aware of the conditions impacting impersonators and tribute bands. But the BiaB artists have been paid, and if you have purchased BiaB, you have a license to use what the artists have contributed, royalty free.

But I also understand how tricky this is. If I purchase vocal lessons from Elvis (ha!) and end up singing similarly to him, that's probably ok. But if AI is fed the (purchased) Elvis catalog and produces a vocal facsimile...not ok? Hmmm.

All I know is...a LOT of lawyers are going to make bank on this topic.

DC Ron
BiaB Audiophile
Presonus Studio One
StudioCat DAW dual screen
Presonus Faderport 16
Too many guitars (is that a thing?)