From the conversation with Mild Wind, Han understood the situation.
A long time ago, the learning robots like Mild Wind were all sentenced to exile, and they were thrown onto this planet, under the watch of a group of prehistoric bugs.
The reason these robots weren't destroyed was that this planet was not only a prison, but also an ultra-long-range cruise missile silo base established by the prehistoric civilization.
At the moment, the prehistoric civilization already decided to leave the Milky Way, and they were taking a large quantity of robots in order to facilitate manufacturing and maintenance needs.
For the prehistoric civilization, the more robots the better, and if they are going to destroy these learning robots, then they would have to leave behind more robots that were more useful.
So, the learning robots were saved. They didn't need to be destroyed, and their only mission was to wait for that one day when the base re-opens and then work for the God race.