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 be regulated by the manager. Some managers stated 4 a day, some 5 while some unlimited but not burst posting.
There are no restrictions to the number of posts any member can submit in a day whether the member is in a campaign or not. The campaign manager will not restrict you from posting on any board but the campaign guidelines stipulate the boards that they want participants to post in and the number that will be accepted or counted per day. But you are free to post on any board but you must ensure that you complete your post in the stipulated boards to get your reward.
Campaign managers make these rules because the product or service participants are expected to promote have targeted clients and most of them can be found in large numbers on some specific boards. Also, some sections of the forum don't display signatures, so posting there is needless. Limiting the number of posts per day is to ensure that campaign participants are active on most days of the week. If don't make such rules some participants might decide to complete their weekly quota in one or two days.