You do not see users using facebook to sign in complaining so it is also likely that facebook also paid them to do this. Also first they change the page and produced the problem then a few days latter added the link to sign in to face book.
Most likely they were paid to push users to switch to apple devices by providing annoying problems with other devices. He said it was done to provide better security but you do not see post about apple devices having this issue just windows based pc and android devices. He also made it sound like the link to sign out changing your preference would not be fixed. They decided it was a unneeded tool and removed it. In another thread a ebay rep said to quit complaining. If you do not select to sign out it should hold but who knows if you get signed out then yes you will have to go back and reset your preferences.
