There's no such merit scam. I wouldn't say merit exchange with alt accounts is cheat the community, but it's unethical. Since @theymos already pointed out leaving negative feedback because of merit exchange isn't appropriate, then we need to deal with it.

What I don't understand is why no one give neutral feedback to both @Haunebu and @3kpk3 accounts? this can be a reference whenever a campaign manager want to accept them to be in the campaign.

However I checked the feedback you leaved on their accounts, do you think you're correct by leaving negative feedback? I will tag your account with neutral feedback.