sgForums only require them to type in a nick and agree to the
terms and condition.
After this, you will be brought to your Profile page, to enter your
email address.
Automated spammers are able to bypass this, and thereby registering
themselves.
Now, it's common for forums to enter random numbers/letters
produced by the server to verify that you are a human and not
robot. However, that can be bypassed too, although not too common
yet.
