The expiry date seems to have been removed and says limited time. Also a few more books have been added
It might be because they are in PDF format ? I am voting hot but its not the most user friendly format for reading lengthy literature.
Maybe because of recent controversy that they had?I think about the professor that worked there idk her name but she had a big forehead lol.
Maybe because it's mostly about what's happening in an another land
I think it's a good collection of books and wish Cambridge university press could make it free all year