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"To continuously enhance your experience, we may add or remove features, modify service limits, introduce or retire services, and conduct experiments to test new improvements. If we make material changes that negatively impact your use of our services or if we stop offering a service, we'll provide you with reasonable advance notice, except in urgent situations such as preventing abuse, responding to legal requirements, or addressing security and operability issues."

Google reserves the right to add, remove, or modify features and services at will, with only a vague promise of 'reasonable advance notice' for material negative changes — and even that is waived for broadly defined 'urgent situations.'