Part of how you know that no one they send there is going to actually be a gang member or terrorist or anything like that. Those guys wouldn’t be going without a fight. And with no due process and no chance of ever getting out, it’s not like they have anything to lose.
If this became a trend it would probably just push the studios to be that much more focused on big franchises where the director is just doing a job for hire. And of course, their long term goal of being able to replace as many people as possible with AI, just as soon as the slop it churns out is good enough sell tickets.