It has never been cheaper or easier to influence millions of people, either deniably-subtly (though omission, selective results, "hallucinations" etc) or via sock puppetting.
If I am a government, there is nothing more valuable to me than being able to control the discussion, the overton window, and the prevailing narratives. LLMs are a very low cost way to do that, can be tailored at the individual level (unlike most current TV news, personal "feeds" etc) and have the benefit of a huge volume of context.
The models are effectively black-box weights and are resistant to bias-tests. IMO, a key development will be having an "overlay" of weights to apply on top of a "clean" world model that is tailored to whatever interests can pay for it. Being able to serve that overlay dynamically, or atleast per-user is the killer app.