Locks on boards

Recently we gave away ~100 Galileo gen2 and ~100 Edison+Arduino boards to developers. The default login was
root, no password.

I was watching carefully as people started working with their boards, to see if they change the password. About 50% did. What were the rest thinking? They were all on the same class C network, so anybody could log in to anybody's board. Even by mistake. Then I realized that the rest don't know "passwd" command :)