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

Europa Universalis IV - Development Diary 28th September 2021, Page 14

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Changes in the map between release and Common Sense : r/eu4

EU4 - Development Diary - 26th of May 2016

Europa Universalis IV - Development Diary 14th of March 2023 - Government Mechanics + Free Content, Page 10

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

AI Bankruptcy Paradox Interactive Forums

Steam Workshop::Dukko's Tinkerer Shop [PYXIS]

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

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