I found this part interesting.
The studios have strongly taken issue with this characterization, claiming a background actor's digital replica would only be used on projects the performer was hired for, not indefinite future productions.
The cynic in me wonders if they're mass scanning like this for AI use. Consider that they have maybe 1000 extra for a movie and maybe less (or more?) for a TV series.
Say they just routinely scan them all. How long before they have enough data to use diffusion or similar techniques in order to spit out new unique "extras" based on all this data but, not any specific person?
How could you even prove you're part of any of these generated "people" ?