If the user is not in a campaigns, he or she has the unlimited numbers of posts in the forum. Because at that time, he can posts whatever and whenever the user want. But whereby the user is in a campaign, then the user has to follow the manager's instruction. There are so.e specific boards that the manager would not like to participate so he would tell his participants not to post on those boards and those boards would be specify on the main thread of the campaign. And also the number of post per day can also be regulated by the manager. Some managers stated 4 a day, some 5 while some unlimited but not burst posting.
If any manager said I have to escape posting in any section or not posting as many posts as I have something to say I'd be very angry. But no, no one does so. When they mention some sections that means they will not count posts in those sections for payment, and that's all. I can post in there as much as I want. When they say no more than 4 or 5 posts a day it means the same: if I do more posts they just count not more than the mentioned number a day. It is usually made not to get all posts in a single day from some campaign participant.
I don't remember I ever met any manager that had any restrictions on campaign participants posting. They just don't count some posts and it's okay.