Many billionaires allocate portions of their wealth to philanthropic efforts through foundations and direct charity donations. This not only benefits society but also enhances their public image and can offer tax advantages. (see link for Bloomberg).
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How do billionaires use innovative investments and startups?
Investments in emerging technologies, renewable energy, biotechnology, and fintech startups can help billionaires grow their wealth and gain status in technological and scientific spheres.
Many emerging forms of technology require huge investments, and billionaires can provide them in exchange for stock or board positions that further their financial and professional influence.
Effective Altruism is a great source of ROOT SOLUTIONS TO ISSUES.
https://funds.effectivealtruism.org