RetroPGF rewards individuals for their contributions to the ecosystem, emphasizing impact and usefulness in alignment with Optimism's vision of "impact = profit." Funding through RetroPGF is distributed retroactively after projects' impacts have been realized, with no guarantee of reward for any specific project. The emphasis is placed on rewarding positive and valuable projects with potential for bootstrapping based on their early promise. To get involved in RetroPGF, developers can explore the Ecosystem Contributions board for project ideas and opportunities. Community builders can also participate in programs like the NERD program for support and onboarding or the Ambassador program for marketing and business development. Overall, RetroPGF aims to supercharge Optimism's ecosystem by incentivizing contributions to the development and use of Optimism, focusing on supporting public goods that enhance the OP Stack.