Large language models reduce public knowledge sharing on online Q&A platforms https://academic.oup.com/pnasnexus/article/3/9/pgae400/7754871 GenAI companies all take and do not give back to anyone. So why would anyone contribute back? People contributed on forums or wikis, hoping the knowledge base would be helpful to fellow humans. Still, they are used by AI companies, ignoring all licenses and not giving any credit to anyone.