If the only way to complete a contract is to perform an illegal act, you will be excused from performance. But if you have an alternative, it's a valid contrac

If the only way to complete a contract is to perform an illegal act, you will be excused from performance. But if you have an alternative, it's a valid contract for the legal alternative. IE if i say "i'll pay you $1000, and you will deliver to me rice or smuggled opium", this is a valid contract to pay $1000 for rice. Also as i mentioned, you will generally be required to pay restitution. That is, pay back any benefit and least stop using/doing whatever benefit you are accruing(in this case, i presume using the service). So you can't use it to your advantage.