Why did Sam leave Jane Street?

Sam left Jane Street to join the Center for Effective Altruism full-time. However, shortly after leaving, he started a trading firm and attempted to recruit several Jane Street employees, which caused some dissatisfaction among them. This venture initially went well with successful trades, but soon faced significant challenges, leading to a split within the company and financial struggles due to large loans taken out for initial capital. Eventually, this venture evolved into FTX 1.