Penalties alternative 1:
Each time a removal request are being made on a host that has been listed several times, a penalty timer will kick in. This means, for each time a server gets delisted, and then returns, there will be a penalty time for the next removal. When there are too many penalties set on a host, the API will prohobit future removals.
Penalties alternative 2
A host must, after a penalty, not return in the register after XX days have passed. If this happens, another penalty are added, which means the server owner may be able to decide him/herself, how fast a host can be removed from the database.