Why do Disney past stars don't become legitimate hollywood actor stars?

Raven Samone, Hillary Duff, Zac Efron and the whole high school musical cast Shia Labuff (to an extent) How come we don't see them become a legitimate movie star like Mark Waldberg, Will Smith, Morgan Freedman, and others. Are they not consider because they came from the Disney franchise and that leaves a... show more Raven Samone, Hillary Duff, Zac Efron and the whole high school musical cast Shia Labuff (to an extent) How come we don't see them become a legitimate movie star like Mark Waldberg, Will Smith, Morgan Freedman, and others. Are they not consider because they came from the Disney franchise and that leaves a permanent mark in some of the directors eyes that they are not to be taken Seriously? Is it their luck with disney and their past with disney hurts them?Is it they are not actually talented beyond the realms of kids? The ones who remotely made a name from themselves outside of disney was Shia Labuff and I wouldn't consider Transformer a chance to see his real acting but it seems that he is the only one who made it out of the disney franchise and still manage to have a career.
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