I believe it is quasi personal, and he will likely use it as part of his past president commitments and all.
It is a huge slush fund.
https://www.hpherald.com/evening_digest/obama-foundation-fundraised-311m-in-2022-highest-year-yet/article_ef1801d8-37d3-11ee-ad79-f3f5515f4776.html
More than $29 million was spent on salaries and benefits; several of the foundation’s top executives also received pay bumps. The foundation’s CEO and director, Valerie Jarrett, made more than $754,000, up from $593,000 the year before. Then-President David Simas made about $696,000, up from $584,000 the year before. Executive Vice President Robbin Cohen made about $652,000, up from $535,000.