Bollywood is both the world's largest and the world's smallest film industry.
Although enormous in scale, from the outside it appears to be an extremely closed industry where power is concentrated in the hands of a relatively small number of people and studios.
Hollywood, on the other hand, offers a far larger platform for such activities.
In Hollywood, the concept of a "star's child" doesn't really exist. That said, it's not like the children of famous actors never become actors themselves. I've already given a few examples.
However, Steven Spielberg and Martin Scorsese are unlikely to be the ones to "launch" Colin Hanks or Dakota Johnson into the world.
In Hollywood, there's no such thing as a "child star debut." At least, it's not like Ananya Pandey or Janvi Kapoor were "debuted" by one of Bollywood's largest studios.
The fact that Colin is the son of Tom Hanks, one of Hollywood's greatest treasures, doesn't seem to have had a dramatic impact on Colin's chances of stardom.
In fact, Colin often downplays the fact that he is Tom Hanks' son. His background hasn't determined his career or the opportunities he's had.
Others have chosen a similar path. Nicolas Coppola, nephew of Francis Ford Coppola, changed his last name to Cage to establish his own identity.
In Hollywood, the principle of meritocracy is more firmly ingrained. Will Smith's son, Jaden Smith, suddenly disappeared from the public eye. He was certainly given opportunities, but it didn't work out, and now he's been sidelined.
That doesn't happen in Bollywood. Most "children of stars" with even a little talent are given countless chances, and even those who do disappear don't disappear until they've experienced multiple massive failures.