As far as being removed from the campaign in this case no reason would have been better than what was given really. Unless you were out slamming who/whatever you were promoting there is no need to punish. That being said I've always assumed a campaign manager could add or remove users as they see fit, considering it is their name and reputation on the line.
I do not believe it was jeremypwr. He has already removed or changed users without giving any great explanation. He does not need to create a great reason to remove someone... unfortunately.
Sometimes people holding all the cards enjoy playing and making people squirm. I honestly have no knowledge of the individuals involved, so I'm not saying this is what has happened. It just wouldn't surprise me that someone spent a few extra minutes of their time to toy with someone for their own amusement.
I would say the weirdest part of being offended so late in the game is that they had replied to that comment in that thread.
What a loss, however he/she might try to get in sig campaign as some campaign would accept the account as Member Ranked, Since it's been proven as blackmail is there any chance of it being tagged ? 
