I regularly check my campaign threads and spreadsheets several times a day to ensure that everything is in order. In a typical week, I may occasionally miss a day or two of checking, but that's exceptional.
I haven't seen this being an issue in the forum provided there is a good communication. I think Op believed he informed Royse777 about leaving the campaign, but he did it in a wrong way. You wrote that you are leaving a particular campaign that your post count as of when you made the post of leaving the campaign was 1000, then you removed the signature. Let's say the manager wasn't online and managed to come online after 12hrs, saw your post and noticed you are wearing another signature. How do you want the manager to believe that it was excat 1000 posts you made wearing the signature of your previous campaign?
The user removed the signature more than a day before the campaign week ended. If this occurred one or two hours before the week's end and was accompanied by a post confirming the change in status, it could be considered somewhat acceptable. However, missing for over a day out of a 7-day week is not acceptable.
A member might mistakenly remove their signature, but if they realize it was a mistake within a few hours and I trust that the incident was genuine, then I have no problem with it. This situation has already occurred with one of the signature campaign participants in a campaign I managed. All these situations are assessed on a case-by-case basis; there are no set rules, but it is always advisable to review the campaign rules. One of the important rules is as follows:-
▶️ You are not allowed to change anything on the signature code, if found then you will be disqualified without prior notice.