Earlier quoted context omitted.
You agree to give up your data in return for services. Yahoo mail, or gmail for that matter aren't actually free. You are trading your data for a service.
No contract may take away a person's rights.
Aren't all your comments proof of Y Combinator's human rights violation against you? Shall we have HN shut down and its operators jailed? Obviously this isn't the world we live in, but isn't it the one you're arguing for?
Maybe you can't give permission to have data treated carelessly, but it seems absurd to say you can't give permission to have data collected at all. Opening an account with Yahoo is surely consent to let Yahoo have a record of that account.