To be clear: this new greeting / agree page is independent of the password or no password at United Clubs.

Some clubs have a password, and then after entering the password you wind up at the page in the screenshot above.

Some clubs do not have a password and you go straight to that page. However, it has been the case for quite some time that some clubs do not have a password.

I did not test as I always use the daily password, but I have to assume that the security flaw for MP credentials is still present for the clubs requiring sign in before this greeting page.