Not only the Pi Clan, but most other Starry Sky Foreign Races, including The Man in White, are essentially like this. After discovering a habitable planet of the Human Race, they only plunder resources and then leave.
They don't occupy a suitable habitable planet for the long term like the Human Race, spreading and expanding...
Of course, the Starry Sky Night Yaksha is an exception because the Yaksha People's terrifying infection ability not only plunders resources but also populations. All human planets they discover are doomed with people, land, and all resources exterminated.
Although the Pi Clan has only one Ancestral Star, there are more than a dozen abandoned planets around this Ancestral Star, transformed into Mining Stars, Industrial Stars, etc., used to build warships or excavate large underground spaces to establish underground warship bases.
