Yes, it is a scam. I fell for it. I've sent in about $22 , but I got some suspicion and tried to withdraw my money back. After one day of waiting, the transaction was complete. Precisely $0 were sent back. Ethereum blockchain link to the transaction:
https://etherscan.io/tx/0x7b6b85c48d87a7316e7e68cc1f612abc760dd11252b057236339ecf59e5a3b44