Ask literally any voice actor if they get royalties from the video games they worked on.
They will tell you no. They might even laugh.
Now imagine any developer actively trying to use AI VO to save money wanting to offer something like that.
LittleKuriboh
Also, re: "they get royalties", how much money is that? Does it make up for the lack of continued work?
Paying next to nothing is still "getting paid royalties" but is functionally nothing.