The result, naturally, was Chen Qing defeating them completely, and those less fortunate, even losing their lives.
Chen Qing didn't kill them directly, but her actions were more cruel than killing them.
Chen Qing infected those people with the Mechanical Virus, making use of everything, squeezing out the last bit of their value.
Some were pirate groups that had just started, and they encountered Chen Qing before they could do anything.
War breeds a lot of evil, and many people, even if they didn't want to be pirates initially, were forced to a life of crime for survival.
This is different from Chen Qing's original world; here, they would really starve to death.
If you don't rob, then just wait to be robbed by others.
All those newbie pirates were packed off to nearby islands by Chen Qing.
They witnessed Chen Qing's methods of dealing with other pirates and probably never wanted to become pirates again in this lifetime.