$ 0 0 Microsoft co-founder BillGates has regained the title of the world's richest man in the Forbes magazine's annual billionairelist that includes 56 India based billionaires led by RIL chairman Mukesh Ambani. The magazine also referred to accusations of wrongdoing made against Reliance by Aam Admi Party founder Arvind Kejriwal, who had recently alleged that Ambani is "running the government".