Then you don't understand how truly widespread these anti-consumer practices are in contract law.

Contract changes should require notice so we as consumers can knowingly cancel our contracts if the changes do not meet our individual standards. Otherwise, corporations have the power to make us retroactively agree to hostile contract clauses.

Corporations could revoke a right we previously had under the contract that would now be against the new contract. We could be in breach of the new contract because they changed it without our knowledge or consent.