The ETH fee is paid by the cowllector (harvest) bot, which is funded from the treasury. This bot is responsible for collecting fees from transactions and other activities that occur on the Ethereum network. The fees collected by the bot are used to pay for the cost of running the network, such as the cost of running nodes and smart contracts. The ETH fee is used to ensure that the network remains secure and reliable for all users. By paying the ETH fee, users are helping to ensure that the network remains secure and reliable for everyone.