I've been in campaigns that lasted for several years that ended with absolutely no warning at all.
Companies are more ruthless then ever and they see their employees as expendables, just ants on a spreadsheet. People don't have job security anymore, this isn't the 1950s.
I agree with gentlemand that campaigns can end at the most unexpected times
no contracts were signed or anything to protect campaign participants
which one do you think has a high chance of happening,
get fired the next day from work without warning or the signature campaign ends abruptly?