Dan Hauser, the company's creative vice president, spoke about this.
According to Hauser, Rockstar opted out of hiring famous actors for two reasons.
The first of these is the conceit of the stars. As noted by the co-founder of Rockstar Games, they had problems with some of the actors while working on GTA: Vice City and GTA: San Andreas, and I would like to avoid this in the future.
The second and main reason is that the involvement of little-known voice actors allows users to immerse themselves deeper into the game, as players will not recognize familiar voices.
Therefore, if celebrities are attracted, then for small roles. For example, in the upcoming Red Dead Redemption II, which will be released on consoles this month, the role of the Indian chief was voiced by the Canadian Graham Greene, who was nominated for an Oscar.