OP, why only these guys? Merit exchange exists in any locale. Nigerian, Indonesian, and Bangladeshi occupy leading positions in the exchange of merit within locales. But as long as you don't find any matches, you can't accuse them of farming. The fact that these people may know each other is certain, but this is not a violation. The forum does not provide for how much merit to distribute to whom, and nothing is surprising here either.

But, of course, this behavior is wrong. And those people who will read your accusation today should think about this. You are in a community that you want to receive feedback from, but by acting selfishly, you will end up receiving a boomerang of indifference from the community.