If an indie (or even less of an indie) is using AI generation, they are doing so to save costs or work around their very limited budget. Or using it to work around some limitations where voicecasting every line would be infeasible, etc.
And losing the small portion of the miniscule-vocal-always-complaining crowd (who odds are - wasnt part of their audience to begin with), to be able to use AI-gen is not a loss at all.
Data on Steam is telling, these tools are becoming increasingly prevalent.