The fact that several species in Australia are now extinct kinda shows cats do harm bird populations. Cats are usually an invasive species and hundreds of them in an area can decimate local wildlife. Overcrowding only kill birds when there are too many, while cats will always kill birds. There are definitely places where it matters more, like on small islands, but in general any invasive species can massively shift ecosystems.
Have you seen the ai girlfriends/boyfriends communities? I genuinely think the rate of chatgpt induced psychosis is really high, even if it doesn’t lead to death