The EU4 devs have been using forum suggestions to aid gaps in AI

One fan in particular managed to reverse engineer AI behaviour in a way that was easier to understand than the code itself

Victoria 3 - Dev Diary #99 - Colossus of the South : r/victoria3

Europa Universalis IV: Origins - Announcement Trailer : r/paradoxplaza

Collections: Teaching Paradox, Europa Universalis IV, Part III: Europa Provincalis – A Collection of Unmitigated Pedantry

Unbalanced Institutions Paradox Interactive Forums

Collections: Teaching Paradox, Europa Universalis IV, Part I: State of Play – A Collection of Unmitigated Pedantry

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Legacy of the Golden Dragon: An EU4 Anbennar LP - The Something Awful Forums

EU4 - Development Diary - 7th of September 2021, Page 15

AI Bankruptcy Paradox Interactive Forums

Europa Universalis IV - Development Diary 13th of December 2022 - Roadmap to 1.35, Page 10

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Can we please make the AI not delete its entire army the second they are in a deficit

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Let's Play Europa Universalis IV: Anbennar - Current Campaign: Balrijin