That plus the real name policy[0]. One month after launch:
> Conflicts regarding Google+ began in July 2011 when the social networking site began enforcing its real name only policy by suspending the accounts of users it felt were not following the policy.
> Conflicts regarding Google+ began in July 2011 when the social networking site began enforcing its real name only policy by suspending the accounts of users it felt were not following the policy.
[0] https://en.wikipedia.org/wiki/Nymwars