Hive mind transmission as sort of firewall that destroys potential competition for advanced aliens
This series could be inspired by book series like "3 body problem" where advanced species are both hiding and ruthlessly trying to eradicate all potential competition before they progress too far and become threat.
Maybe the signal is meant to block out emergence of advanced civilizations around the creators species. If nearby species progress far enough to receive radio signals from space and make custom DNA or RNA then this signal would turn them into hive that starves itself to death and dedicates its last generations to producing antenna that would spread this signal further creating sort of enslaved dying zone around the creators.
While the hivemind lives it uses the knowledge to modify genetic material that helps them figure out how to infect those few who are immune to initial version and achieve absolute enslavement. If they somehow avoid starvation for many generations (despite not being willing to harm bugs even if those eat their foodplants) and the creator aliens reach them then they'd be too pacifistic to fight back.
The hive is extremely subservient to all who aren't part of it as is obvious from how they treat the immune who might loath the hive or are actively hostile towards the hive. Even those who want to kill them receive same amount of love and obedience as those who like the hive. If creators arrive then they could easily kill or isolate those few immune individuals and instead command the hive to do what they want. If immune ones use some clever trick to make hive resist invasion peacefully then invader could easily give seizures to the entire hive around the hive by directing negative emotions intensely enough.
This show could be great stepping stone to some dark sci-fi universe about extremely advance aliens that could harness such weapons and who don't play around with lasers or by relying on big alien bugs as is common in many sci-fi settings.