Why do I get a Warning: "Report it or find help. Images of child abuse are illegal" notification when I search Google for "loli.net"?
Because loli, or lolicon is a term (slang) for underaged children, in Japanese culture. Similar to hentai = animated Japanese porn, loli leans towards characters that look like kids/ pre-adolescents,
Therefore when some enters it, Google would think its about searching for the genre.