I have noticed that all these chinese miners are not paying gas.
Even the big pools like f2pool have no gas costs as seen below.
https://etherscan.io/address/0x61c808d82a3ac53231750dadc13c777b59310bd9#mine
Even the big pools like f2pool have no gas costs as seen below.
https://etherscan.io/address/0x61c808d82a3ac53231750dadc13c777b59310bd9#mine