I feel there needs to be more nuance to how this AI is used.
For commercial settings (including streaming), permission from the voice actors must be given first, or at the very bare minimum monetarily compensated at their full rates for the amount of time those voice lines are used.
However, if I want to mod Baldur’s Gate 3 for fun and add a new companion into the game without any expectation of profit, as long as my usage of the Narrator’s and other companion’s voice lines don’t stray from the established style of the game, I should be allowed to use AI to create those voice lines until I secure funding (either through donations or Patreon) to actually hire the voice actors themselves.
Fun fact, BG3 only has a max of 4 body types per race, and the lower genitalia each have their own models to fit each body type, and that’s just for the “normal” sized races. The short races also have their body types, and so does the Dragonborn. Each armour and clothing piece has to have one unique model and rig to fit each of those body types; that’s a lot of modeling and rigging work.
Now how much gear is there in Runescape?