Lame_Wolf - 7:42 pm on May 11, 2012 (gmt 0)
The ads were placed at the bottom of pages but some of the pages had contact forms on them and those forms get bots attempting to submit them. I suspect the bots were clicking anything in the vicinity of the Submit button.
Personally, I don't think that was the reason. If it were, there would/should be something in the TOS to warn people of such actions.
The ads were right below the submit button.
Depending on how close, could be a reason. But that should be a warning, not a ban.