You can't compare this to changing campaigns, having a partner is a lifetime contract under for better for worse, except for death, another instance is when there's separation due to misunderstandings, they may decide to part ways, but how many people are involved in this kind of act, the conditions given in joining a signature campaign may not be favourable for you anymore and you can make a decision of changing or leaving at any time, everyone work for the organization that signed us in because we are fine with the conditions attached.