So I'm not sure if this has already been reported or not but on a sandbox map vs normal AI, when I am ready to conquer the galaxy I can offer 5000 credits per turn to a faction and have the AI give me all of their ships. If i declare war in the same turn and send in a fleet of transports i can literally take their entire empire in a few turns without a single space battle because i now own all of their space craft, and if they have a large amount of transports I can even use them to take their planets. It is insane that after contact has been made with all the races I can just offer a few thousand credits a turn take all their stuff, including tech, go to war, conquer them, or just sell wait until I can vie for peace with them, which they will accept because they gave me all their ships.