Many sides to this for one there’s a lot of people in the world who simply don’t care where their entertainment comes from as long as it makes them happy.
Another side is. I’ve never met most celebrities, I’ve seen them in movies and on tv and read about things they did. If someone creates a perfect recreation of a well known celebrity acting in a movie, then go on to show that recreation showing up at red carpet events and doing interviews with other perfect recreations of well known personalities, write articles about things they did etc, and no one ever told me that they were not the real person, how would I ever know?
Same goes for double if they just create a new set of celebrities, the fact is that new people appear in this space every day, someone I’ve never seen before suddenly makes it big with a new song or something and it’s the first I’ve ever heard of it, I have no way to verify if it’s a real person or not. Sure I can look it up but all I find is a bunch of generated articles, tweets, interviews etc designed specifically to convince me that they are real.
It’s a change to improve your overall experience