Many science fiction writers are literary autodidacts who focus on the genre primarily as a literature of ideas rather than as a pure art form or a tool for the introspective examination of the human condition. I'm not entirely at ease with that self-description.
The idea of Curious Yellow, of surrender to a higher cause, seems to appeal to a certain small subset of humanity. These people manipulate the worm, customizing its payload to establish quisling dictatorships in its shadow, and the horrors these gauleiters invent in its service are far worse than the crude but direct tactics the original worm used.
I have time to write 1-2 novels per year, and get roughly novel-sized ideas every month. I have to perform triage on my own writing impulses.
If an idea is compelling enough it'll stick in my head until I am forced to write it. If it's forgettable, who cares?
Writing your own story around the same ideas is not plagiarism; at worst, it's being unoriginal.