There is no guilt or innocence in a civil case. Instead there is a finding for one of the parties involved. In this case one party said, "You used to do this and you said you wouldn't anymore. Do you still do it?" and he answered "I'm not going to tell you." Of course the finding is going to go against him.
How the heck does one prove they're not doing something anymore? Whether that "something" be beating your wife, cheating on your spouse, or running an illegal website? Can't prove a negative.
Well, presumably there was some amount of evidence submitted that he was still running the site. We don't know how strong it was, but if the standard is "preponderance of the evidence" then something beats nothing.