I am a bit confused as to what would be cheating.
Ultimately, that's up to the campaign manager. I just make it easier to catch cheaters.
If the week starts on the 14th of sept 2023 and I do 50 good posts by the 16th of sept 2023.
Can I leave on sept 17th go to another campaign as I fully did do the max posts for the week.
I wouldn't allow that if I'd be the campaign manager. You're not only paid for making posts, having all your posts show the signature for the agreed amount of time is part of the deal.
I'm still waiting for a campaign that pays extra to users who have tens of thousands of old posts.As a suggestion maybe this can be clarified by the campaign managers that time and posts are needed to get paid.
Usually there's a clause like: "If you remove your signature, you won't get paid". That covers it.