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.
Hey lovesmayfamilis, I don't know if you have any personal issues with the OP, but I'm surprised you would say that. For starters, the posts he quoted are not from local boards. I know how merit 'exchanges' work on local boards and he's not talking about that here.
That account has received an unusually high number of merits for those posts, which have not been given on a local board, and although from what has been presented there is no conclusive evidence that they are part of a farm they seem to me to be strange behavior to say the least.