You earn Research Points by completing Colony missions and collecting hidden artifacts during tactical Hero missions. The "Soft" Lock: You can purchase technologies and freely undo them as long as you have not started and won a mission since spending those points. The "Hard" Lock:
"The calculations were wrong," Quintus whispered. "We specialized in steam-powered ballistas and stone walls, but the Swarm... they've evolved. They're faster than the bolts." they are billions reset tech tree
Once you spend those points, they are locked in. There is no "tech tree respec" button in the campaign menu. You earn Research Points by completing Colony missions
Unfortunately, I couldn't find any peer-reviewed academic papers specifically focused on the They Are Billions reset tech tree. The game's community-driven resources and guides seem to be the most comprehensive sources of information on this topic. "We specialized in steam-powered ballistas and stone walls,