You get to keep only enough to maintain a very modest lifestyle in a low-cost-of-living area, the rest of it has to go towards improving the world in some way.
Edit: Given the previous rules that you must maintain a very modest lifestyle in a low-cost-of-living area, would you rather choose to opt out and not have the money at all?
Move to an undisclosed remote location and start posting massive crypto bounties on the heads of the shittiest people in the world. Like, $100M a pop. Pay a digital sweatshop to spam social media with AI generated posts and memes about it until the whole world is aware. Then wait. See if anyone is able to collect.