But this isn't a cleaning service. It should be reasonably expected that they automatically process your mail for spam filtering and image caching and other parts of the service. They are not using the service for espionage.
And Gmail isn't sold as an advertisement service. The espionage for profit is not the same as filtering and image caching. That is the crossed line which this kind of lawsuit is asking about.
Cleaning services are also reasonably expected to clean desks. They might even temporary hold confidential documents in their hands while doing so. However, once they start reading the document and interpret them, a line has been crossed which no legal fine print can fix.
