I guess this is a consequence of your weekly merit requirement for the campaign.
This is something I understand you did with good intentions to ensure a quality campaign. But if I, who earn merits at almost double the rate the activity, quit a campaign of yours because I wasn't sure I could meet the requirement every week, things like this don't surprise me.
Do you think that in general the rule has been positive?
Looking at the merit histories, it's very curious to me that some users earned exactly 1 merit each week. Does that instantly make them a cheater, no but it makes me want to pay attention to them more and see if my hunch is correct. I decided in the end that keeping the rule as is was going to do more harm than good though. My end goal was to try to improve quality, not to install fear and deception into users.