Crucially, by visiting those websites you gathered a bunch of context clues which told you “this source is trash; I shouldn’t trust it and should look somewhere else”. When you ask an LLM, every source is treated as equally valid. You may have gotten an answer from the utmost professional on the subject or an obvious (to you) scam, they are presented the same.

Even if you are in the minority who asks for sources and truly verifies them, they are often made up (don’t exist) or don’t say what the LLM said they said.