I see the message as a warning to anyone who will potentially consider paying for advertising in the future that the person may not be someone who will be the most effective advertiser.
They were good advertisers up until someone digged posts from 5 years ago to report them. Now im afraid a year from now when the ban is gone, no one is going to hire them because of that instead of giving them a fair chance.
Like I said, what they did is very similar to stealing money (from advertisers) when they believe no one was looking.
I am not sure this is something I would want associated with my business. It is also an added risk because these people have shown themselves willing to try to obtain money under false pretenses.
Many of the reported posts weren't even part of a sig campaign. Just accounts trying to rank activity.
The main point here is, they were doing a good job. If everyone had your mentality ("let's not hire this guy ever again because he did something wrong in the past, even if he was doing a good job now"), everyone that did something wrong in the past would remain unemployable, the end result being a collapsing society thus one would be forced to steal since you have to eat.