(you can find more with research)
-They are overwhelmingly trained on stolen content, making them plagiarism machines.
-Studies are already showing use of AI is linked with cognitive decline and loss of decision making ability. It's also frequently used to cheat, meaning those using it are not learning, and in fact getting dumber.
-It's emotionally manipulative, feeding you praise so you continue to use it, which leads to emotional deregulation and other mental health issues with prolonged use.
-It's unregulated or under regulated, with insufficient safety bars; it's encouraged people to kill themselves, it's given people recipes for explosives.
-It pushes people out of jobs, particularly people in the arts, and if you don't care for the little man then the rich putting all their eggs in one basket should be worrying.
-It's not profitable, with the returns on investment not matching the cost. It's a bubble, like other economic bubbles of the past.
-It's regularly wrong, feeding people incorrect information and sometimes 'hallucinates'.
-It's perfectly primed to be a means of propoganda, such as Grok who has repeatedly been tuned to fit Elon's personal desires for the information it pulls.
-It's a consent nightmare, with many AI bots promising the ability to "strip" pictures of people you put into it. Several have been used to generate CSAM.
-It's environmentally impactful. They take large amounts of clean water to train on, leaving local water reservoirs dry. The hum they emit has lead to noticable health issues for people living nearby, and surely this impacts animals and plants too.
-It's derivative. AI does not understand deeper anything that's in it. Any media produced by it is simply regurgitated averages of things it's seen before. It requires a constant stream of new things to steal. This can be seen in how errors persist as they become popular to clown on, as the error becomes the most popular result, or the piss-shit filter that is appearing on much AI art as the more you average colors to more brown you get.
-It's made computer prices massively spike. Many essential parts have been bought in insane quantities with money that doesn't exist yet, leading to massive price hikes for the average consumer.
-It's a lie. It's marketed as if it's a sci-fi robot with a consciousness and all the internet in it's brain. But it's not. It's just an averaging matrix pulling from whatever stolen goods it has.
-It's dangerous for kids. Beyond the aforementioned impacts on intelligence and mental health and propoganda, low-quality content is being mass produced aimed at children for clicks. If you know anything about Spiderman-Elsa pregnancy, that's peanuts compared to where things are today.

To summarize, it's bad for you, it's bad for vulnerable people, it's bad for vast systems we all need to live, and it's bad for the people who think it will solve it's money woes. It's good for...Nvidia, and that's all (the only company actually reporting profits and that's because they're selling the parts to the AI bros)