They Are Billions Reset Tech - Tree

These points are earned by conquering territories on the World Map. Once you spend these points to unlock a node on the tech tree—say, the Sniper Tower or the Lucifer Inferno Tank—that technology becomes available for purchase in your colonies.

The short answer is . The developers at Numantian Games did not include a simple "Refund All Tech Points" button in the base game or the Survival mode. Unlike a typical RPG where you can pay gold to re-spec your character, They Are Billions treats your tech choices as permanent. they are billions reset tech tree