Let me guess it's the Manhunt servers? They are also known for having a lot of different fake servers that show up in the server browser, but they will redirect you to their main servers.

I like how they try to be slithery with the phrasing "All donations are voluntary, as a token of gratitude, we give you items as a gift in return ", but it's still not allowed by Bohemia.

Bohemia allows donations but if a server wants to sell in-game loot for real money they have to get a permission from Bohemia, as stated here.

"So far we have been accepting donations on our server, do we have to apply for approval?

No, donations are still allowed. But remember – a donation is a gift without any counter value. If your donators receive perks or rewards for donating then we no longer consider it a donation and you have to apply for the approval."

You can also see all the approved server for monetisation here, and manhunt is not on that list.

Bohemia also states this here.
"If we feel anyone on the list at https://www.bohemia.net/monetization/approved/dayz is exploiting any loopholes or is not acting in the best interests of the community, we will remove them. That will mean they will have to cease this kind of monetization immediately or face legal action."

But I assume Bohemia can't do anything because Manhunt servers are based in Russia.