Of course this depends on what services we're discussing but for example, ad blockers and privacy badger cannot prevent Google from reading your E-mail contents

Of course this depends on what services we're discussing but for example, ad blockers and privacy badger cannot prevent Google from reading your E-mail contents. The only thing that can stop that is PGP, and it's not a coincidence that Google has refused to provide any built-in method of E-mail encryption. They know what they're doing. They know it's wrong. Inside they are laughing at their "users" who think they're getting any sort of value from the service. Fact is, Google does not offer _anything_ that is not also offered by someone else, and often without all the exploitative policies.