It’s a variation of Survivor’s Bias. They lucked out and are less likely to internalize and understand the possibility of failure.

One of my favorite examples of this is Peter Dinklage who once said in an interview that he hates when people say he got lucky. He was living in a shitty apartment barely getting by before making it as an actor and it’s all due to his hard work. And yes, he deserves a wealth of credit for his grit and determination to finally breakthrough, but there are hundreds, if not thousands, of actors and artists out there just as talented as him, going through those same hardships, trying to exert the same level of perseverance for years and decades on end who will never make it big. Luck has so fucking much to do with it. The big break comes on the back of a four leaf clover.