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People are joining everything nowadays without reading the rules anyway.
I think they are using bot for registered on any opening signature campaign.
It is possible right ?
I do not think that this is possible. A bot will not be able to read the thread and thus determine if the campaign is open or not. New members doing might be because of ignorance or not being aware about the rules. So far as senior members doing this is concerned, only reason i can think of it is a purchased account and they are not experienced with the rules of the signature campaign. The seller might be selling these accounts with promises that you will get accepted in campaigns and so they keep applying in all open campaigns.
It might be possible, it might not. But we do not need to see this in a larger picture since what really is the problem here is the ignorance of the members applying in that certain Signature Campaign. If a Bot is registered, I don't think that it will be used to that but will be just used to post on a certain post also made by the user.
Bought account may be a possible but the closest answer here is these ignorant members.