Why is in Hollywood new actors or less known actor

Why is in Hollywood new actors or less known actors play in Superhero character but in Bollywood only superstars play Superhero character?

Well plenty of reason-

Hollywood is sea compared to Bollywood that is why it's market is made of global viewers which means talents are coming from everywhere.

In America, people live or coming to get a job like this from all over the world, and they have to struggle a lot to reach there so in that process they become extremely good

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