The reason for moving from the Guild was twofold. For one, having an entire forum dedicated solely to the Athalia Academy roleplay provided flexibility and ease of use not possible in the Guild's single thread system, and the Yuku architecture's much more posting options (colored text, etc.) were also a draw. The other main reason was the instability of the Guild, which was worsening leading up to the move. However, the Yuku architecture was not perfect, and when Season Three concluded the Guild's infrastructure had significantly improved to the point where most members wanted to move back.
The website continued existing long after it ceased to be used, serving as an archive for the Carlily fanfiction and some other things. However, it was lost when Yuku/Tapatalk was updated and no longer compatible with the existing forum.