Have you never read any stories just once? from a business man: doesn't have the ability, information, and knowledge can build a multimillionaire startup? We read a lot story a successful person who came from nothing.
Honestly, I don't believe in most of the success story that is published on the internet unless there is a detailed foundation of the story. Just like SBF story, many are made up story to establish a reputation for future events. There are lots of marketing people sharing stories of success to establish someone's reputation, but if analyzed, they were exaggerated.
But in the case of @BlackyJacky's question, it is very possible if the needed requirement is met.
What are the needed requirements to run a multi billion USD worth crypto currency online casino operation?