ls -hl /etc/skel/Videos/Default/Sailfish_OS_3.0.mp4
-rw-r--r-- 1 root root 11.9M Nov 21 2012 /etc/skel/Videos/Default/Sailfish_OS_3.0.mp4
You were very lucky that 11.9M made the difference for you. For me it was CHUM stuff in /opt, a few months back.
I kinda understand that Jollyboys want that there for new users, but at the very least it could be placed in /usr/share and only a symlink in /etc/skel, to avoid duplication.