Whenever you get tired of your neighbour that keeps attacking and farming on your settlement, just put a bounty on their head. Its easy. You specify the target of the bounty and a prize and then you wait to see other cosmo crafters subscribing to your bounty.
Once a user subscribes to your bounty, they'll have 7 days to destroy the majority of the target's defenses and spacecrafts. Based on the amount of spacecrafts and defenses destroyed, they'll get rewarded the amount corresponding with the percentage of destructed items of the prize you have defined.
If a user decides to abandon the bounty or doesn't perform at least one attack on the target, he will be punished with a 10% fee of your prize.
Good luck bounty hunters.