It is probably just a coincidence, but it's darkly funny how well this lines up with the strategy described in a rather infamous LessWrong post. The title is "Solutions to the Altruist's burden: the Quantum Billionaire Trick", but you probably know it by a different name. The author is one Roko Mijic.
Yeah, not a total coincidence of thinking style. I just don't think it's likely that SBF was literally thinking about Roko's post as he did the crimes.
It's not the same due to the Law of Large Numbers. The risk involved in many small 51% bets is very different from the risk in a single all-or-nothing 51% bet.