I had a good experience with this campaign. I saw this coming though:
https://bitcointalksearch.org/topic/m.7625954
As soon as trackers are added to the link, it analyzes how effective the sig campaign is and if it's worth it to keep on continuing. Obviously it was not worth it to FXO based on the amounts of clicks generated from the sigs, hence the closure.
lol yeah we should not let sig owners put trackers on us lol
LMAO ....this is ultimate !!! Sig owner is giving an URL to campaigners, whereas campaigners are rejecting to wear it as it will be track clicks