PMPC(Public Money, Public Code) is a concept promoted by EU since 2017. Which is a good for promoting the free/open-source culture, yet still leave some pitfalls which might be used to underturn the original ideal if not executed carefully. This talk gives a brief introduction of PMPC, followed by reviewing certain failed cases in Taiwan in the past 20 years and what still going wrong right now. Then I will propose a principle of PMPTDS, a more complete strategic model to address the previous issues for promoting FOSS or open data when involving public resources, and how it can actually mitigate the previous issues.