Ask HN: Why is Twitter blocking users if they have no Referer header?

While changing some settings (in this case network.http.sendRefererHeader), I got locked out of Twitter. This seems to be an intended feature. You get an infinite redirect loop stating: "If you’re not redirected soon, please use this link.".

I don't think it would be an effective way to fight bots so why are they doing it? Thanks in advance!