If anyone believes they're close to a generalization end-game wrt to AI capabilities, it makes no sense to do anything that could impact their advantage, by enabling others to compete. Collaboration makes sense on timeframes that don't imply zero-sum games.

Board games like the Settlers of Catan are good examples of the behavior— concretely the start of the game when everyone trades vs the end of the game when if you suspect someone wins it makes little sense to trade unless, you think it will help you win first.