I'm not a lawyer either, but Wikipedia says that requires "a meeting of minds".
It seems pretty clear that Sony always intended to require a PSN account (although that wasn't always communicated well, it was stated on the Steam store page, at the end of news articles, and in the game itself) so there was no meeting of minds. Just confusion.
It seems pretty clear that Sony always intended to require a PSN account (although that wasn't always communicated well, it was stated on the Steam store page, at the end of news articles, and in the game itself) so there was no meeting of minds. Just confusion.