One of the top ETH Nanopool miners named "getzil" gets ~520 ETH per month. Hashrate graph is similar to ZIL PoW windows. That means miners are digging ETH for ZIL pool (or coin?) creator and get payed in some (fake?) ZIL coins. Is it a scam pool or fake alt itself?
Read this and you will understand about that correctly https://www.cryptocompare.com/mining/guides/how-to-dual-mine-ethereum-and-another-coin/ i have taken the best article for you based on my opinion. It's really worth to read at least for a few minutes. It's double miner and you can use claymore to do that to mine ethereum combined with another coin even like pascal coin.