The phrase "had a crystal ball" refers to the YouTube founders knowing what happens in the future. It implies that if they had the ability to predict the future, they might have made different decisions.
Read this sentence from paragraph 1 of "YouTube: A World of Knowledge and Fun at Your Fingertips."
If the original YouTube founders had had a crystal ball, they might not have been so quick to sign on the dotted line!
The phrase "had a crystal ball" refers to the YouTube founders
believing in fortune-tellers
owning something expensive
being dedicated and hardworking
knowing what happens in the future
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