We have LLMs and links to TOS, this is easily answerable by _anyone_ on the internet at this point.

Comments+posts are defined as user generated content, you have no right to its privacy/control in any capacity once you post it - https://www.ycombinator.com/legal/

YC in theory has the right to go after unauthorized 3rd parties scraping this data. YC funds startups and is deeply vested in the AI space. Why on Earth would they do that.