Question isn't consent here. Consent is part of what constitutes a contract, but you've clearly consented to their TOS. More importantly, their TOS cannot allow

Question isn't consent here. Consent is part of what constitutes a contract, but you've clearly consented to their TOS. More importantly, their TOS cannot allow or compel a party to perform a criminal or tortious act. If impersonating you is criminal, then the contract is invalid.