The internal order of the civilizations within the Star Federation varies greatly. Many still have systems of slavery, mostly targeting extraterrestrials. Slavery is also seen as a way to flaunt one's status. Of course, no one dares to enslave the Sky People, so humans have become the best substitute. This situation has always existed. Some of the early seed civilizations managed to settle down by exchanging their labor for resources, a practice that continues to this day.
When humans appeared, they immediately experienced a cold market. Humans suddenly became popular, which also added risks to human interstellar exploration.
High civilizations are the same; where there are interests, there is trade. Therefore, humans are now very careful when conducting interstellar trade. The main trading center is still in Kepler, and many traps exist in the complicated interstellar trade. A lot of "tuition" has been paid this year.