LLM's can't just be "the center of knowledge" on their own, they need to learn and be trained if they are to be useful. A whole lot of LLM knowledge comes from Wikipedia to begin with.
Tailwind docs are also the source of, duh, docs. People browse them way less and as a result Tailwind gets way less funding.
The problem is that Wikipedia should be set for life at this point, and they insist on rejecting that notion. There may be a future in which Wikipedia closes, and if that comes to pass it will due to wanton disregard for people's goodwill.