First, I will not evaluate the criteria that a manager will choose someone. Next, there is no injustice here, managers have the right to choose those that they feel good.
In this case, we should discuss
why those members are accepted, definitely, there is shady here.
There are a total of 11 pages of applications in the campaign

He can choose anyone better, who is always active. And now he accepts people who have been inactive for a long time. I wonder if there is any relationship between him and the people mentioned above?

Or they are his alt accounts

I think this should be investigated clearly, or at least he needs to explain

I think it's clearly his alts. some of them apply on a lot of campaign and being accepted there even though their post history is filled with application.
You are right about the manager are free to choose what they feel is qualifying. So his preference is shitposter and inactive participants? This is so wrong for me, I see a lot of good poster there that is obviously more qualifying than those clowns.