WIS is in a tough spot...and I don't have a history of defending them. WIS has literaly no way of knowing if multiple users from the same IP address are related, unrelated roommates sharing an Internet connection to save money or the same person masquerading with alt-IDs.
I have three accounts, all are me, not me/wife/child. I have them because I play FC Dynasty, where having multiple teams is very common but the beta doesn't allow multiple teams under the same ID...so most FCD coaches create alt-IDs to add additional teams.
But I am honest and would never use those alt-IDs to play multiple Hardball Dynasty franchises in the same world. If I wanted to have more than one HBD team, and I have many times in the past, I'd just get a 2nd team under this ID, my main one. But my 2nd ID was created in 2009 and has HD, SIM league baseball/basketball, etc. history on it. I even won a GD Championship on it so it looks legit if I suddenly became unscrupulous and wanted to portray it as a separate person, a "spouse" if you will.
I don't think WIS is trying to be vague with the Fair Play Guidelines. They are trying thread a needle.