From a user point of view? A lot. So far the AI has made itself the champion of the creation of fake. Fake news, fake pictures, fake videos, fake history, fake identity. Do you think that the AI will be used for your own good? Do you think that your private data are farmed for you own good? I don't.
That's addressing whether the mere existence of LLMs is "good" or not. That's not going to be affected by whether someone changes their username every couple of months or whether some particular social media site makes their content annoying to scrape. LLMs exist now, and they're only getting better; attempting to staunch the flow of genies out of the bottle at this stage is futile.
Personally, I'm actually rather pleased that my comments on Reddit over the years are factoring in to how LLMs "think." All that ranting about the quality of Disney's Star Wars movies not only convinced all the people who read it (I assume) but will now also convince our future AI overlords too.