Future prospects for child stars can vary dramatically. Some make a couple of movie appearances and then disappear. Some go completely off the rails. None of them usually go on to become billionaires, which makes Brock Pierce exceptional. He had sustained success as a child actor in the 1990s, with a string of credits including 'The Mighty Ducks' and 'Problem Child 3', But that's not where his money really came from.
Pierce turned his love of video gaming and technology into a fortune. He founded internet gaming company IMI Exchange in 2001, which was soon generating income of $1m a month, and then his real masterstroke was investing in Bitcoin when it was cheap. As the cryptocurrency boomed, the value of Pierce's coins went through the roof, and the end result is a former child actor who's become a billionaire before he's even turned 40.