Selling, buying, sharing, or giving game accounts to other players is against our Terms of Service. Each game account should be used by just one player.
Account Sharing Risks
Sharing your account puts your privacy at risk - as well as all your other accounts. If you share your account with other players, they might end up taking control of the account, and it might be impossible to get it back.
Sharing your account might also result in its misuse, in the form of spent resources, or disruptive behavior, leading to account penalization. Additionally, if Supercell detects a shared account, the account will be suspended and potentially even permanently banned.