[while] new commerce on the Internet has exposed courts to many new situations, it has not fundamentally changed the principles of contract . . . when a benefit is offered subject to stated conditions and the offeree makes a decision to take the benefit with knowledge of the terms of the offer, the taking constitutes an acceptance of the terms, which accordingly become binding on the offeree.
Id. at *2 (quoting Register.com, Inc. v. Verio, Inc., 356 F.3d 393, 403 (2d Cir. 2004).