We don't know if administrators set it up because of bots or suspicious attacks. It's possible cloudflare did it if they're upgrading their services.
I am having the same issue. Thank goodness, I am not the only one experiencing this. It is happening on both mobile and desktop browsers. It is annoying as I am already used to fast logging in on the with just a click of the button. For now, if the administrators set it up because of a suspicious attack like bots, them I am in 100% support for it.