Why did Fischer leave the US?

I'm curious to know, why did Fischer ultimately decide to leave the United States? Was it a personal decision or was there some sort of external pressure or factor that influenced his move? Did he feel that he had reached the pinnacle of his career in the US or was there something more compelling that drew him away? It's fascinating to consider the motivations behind such a significant life decision, especially for someone who had seemingly established themselves in the world of finance and cryptocurrency.