If you wish to download a DLC it becomes mandatory.
If you wish to play online it becomes mandatory.
If you have credit onto a PSN account it could be a big mess to have it back if you don't loose it at all if you cannot accept.
If you buy a movie that requires an online connection it becomes mandatory.
It's optional my rear.. It could be simply an unfair, awful, useless move.. that many ones will not forgot with ease...
Yes, but if you will buy 1 week or month afterwards a game that needs an updated firmware it becomes mandatory to install it AND to accept the new agreement, otherwise you've bought a game that you cannot play.