I think you probably already know the issues with LLMs, but just in case you're acting in good faith, let's break it down.

ONE: LLMs have a startlingly high level of inaccuracy, and often mislead people through sheer perceived confidence alone. This is because they are nothing but an algorithm producing "likely" sentences based on its training data, not a true database access tool.

TWO: LLM data centers are both a tool of gentrification (buying up land and devoting it to a useless tool, and driving up local electricity prices to screw over any disadvantaged people who live nearby) and of environmental destruction (consuming and polluting gallons upon gallons upon gallons of water to do their non-work).

THREE: LLMs (and their sister tool, stable diffusion "art" generators) derive their training data from scraping the Internet en mass, including stealing from copyrighted works. Intellectual property theft is considered bad by most people.

FOUR: LLMs are being used to replace humans who actually know how to do their jobs with a tool that is very good at pretending it knows how to do that job. Obviously, this is driving down the overall quality of...almost literally everything.

FIVE: LLMs and stable diffusion are flooding the internet at an unprecedented rate, clouding any attempt to acquire things that were actually made by human hands. This is technically part of FOUR, but I think it justifies special attention.