I also thought this other EA Forum post was a good overview of the general idea of altruistic software development, some of the key obstacles & opportunities, etc. It’s mostly focused on near-term projects for creating software tools that can improve people’s reasoning and forecasting performance, not cybersecurity for BCIs or digital people, but you might find it helpful for giving an in-depth EA perspective on software development that sometimes contrasts and sometimes overlaps with the perspective of the open-source movement: https://forum.effectivealtruism.org/posts/2ux5xtXWmsNwJDXqb/ambitious-altruistic-software-engineering-efforts
You might be interested in this post on the EA Forum advocating for the potential of free/open-source software as an EA cause or EA-adjacent ally movement (see also my more skeptical take in the comments). https://forum.effectivealtruism.org/posts/rfpKuHt8CoBtjykyK/how-impactful-is-free-and-open-source-software-development
I also thought this other EA Forum post was a good overview of the general idea of altruistic software development, some of the key obstacles & opportunities, etc. It’s mostly focused on near-term projects for creating software tools that can improve people’s reasoning and forecasting performance, not cybersecurity for BCIs or digital people, but you might find it helpful for giving an in-depth EA perspective on software development that sometimes contrasts and sometimes overlaps with the perspective of the open-source movement: https://forum.effectivealtruism.org/posts/2ux5xtXWmsNwJDXqb/ambitious-altruistic-software-engineering-efforts