Why do threads get closed?

The thread: "Cenerentola blunders a rook!!", was closed. I'd like to know why. I would also like to know why Cenerentola remains on the site, when he, rather it, should be banned.

@rickgarel

Someone recently found a way to bump old forum threads from four years ago onto the first page.

One for the scriptures🤷‍♂️