

Because it really doesn’t. For most tasks, it would require more human energy to do the work than an LLM, just because we are much slower at it than an AI. I mean, humans operate at around 80 W just by existing (basal metabolic rate).
If the AI is powered by renewables, it’s cleaner than humans. If it’s powered by fossil fuels, it’s likely much worse (though I haven’t run the calculations).
Now obviously, this presumes that the output of an AI is even valuable at all, which is often not the case.
Anyone who gets uncomfortable with government surveillance because it could be used to target certain demographics of people needs to look no further than what Israel has done to prove their point.
The only thing stopping the world from autonomously targeting people by online demographic is common human decency, and humanity is running on very short supply of that these days.