One way that LLM harm privacy is through training on, well, everything the tech co can get its hands on. Which can include your posts, and anything you disclosed IN those posts. Not to mention anything you typed into most of the big LLMs on the web.

Once that info is trained into the model, you can't just go delete it! If it was a file on a disk, in theory you can remove that. OK, sometimes that's hard in practice, but in theory you can. When it's baked into model weights, that's different. You can't un-bake it into the model!

People have found that commerical LLMs will give back personal info about themselves. Their phone numbers. Where they work. Sometimes even health info, if somehow the model got trained on that! The model does not 1-for-1 recall everything it got trained on. But it does get represented in the model, and sometimes can turn up later, inaccurate or not. LLMs are also good at analyzing unstructured data. So even if you never told your name, but there are enough tidbits to collect, they can de-anonymize people. I read something about that. I will try to find the link and post it if I can.

I do not think LLMs are 100% bad. They have good uses, valid uses. But an ass ton of risks and drawbacks too! I'm not sure society is ready for it. Or ready for more and more social media being bot posts. And those bots becmoing harder and harder to detect.

It's possible to run some LLMs locally if you have a good GPU. That helps with SOME, not all, just some of the privacy issues. Doesn't help with many of the other risks tho.