So I played for 1203 turns and found a way to generate 1+ billion culture per turn, then went wild with my 20k~ tech points and added about 50-100 points into everything, my population reached the billions, I had billios of people working everywhere and my threat level was constantly 0-0.2%.
I then thought it'd be a fantastic idea to spend another load of tech points, the game exploded and my population became 0/-1.9 (+206m). With no population; none of my fields, pastures ,fishers, miners were working yet the threat level was still at 0-0.2%.
I now have NULL/1.9b culture per turn and 40x tech points.
lmao, what did I do!