One thing that is often overlooked is that intelligence services are in the job for another reason than to monitor armed enemies. They are monitoring foreign businesses as well, to give their own Govt (and sometimes foreign customers, or domestic businesses, if the agency sees that as a good idea) an upper hand in international trade. For that, having access to emails is just what they want. Mind you, heavy interests, as well as criminal organizations, terror groups, foreign Govt's, big corperations involved in big money deals etc, tend to have their email heavily encrypted but ever so often that one piece of email goes out unencrypted.
Then of course, you have the dunderheads who have no idea their emails and phones are subject to automatic tagging and investigation if words or phrases of interest are included in the conversation. They are a gold mine for the agencies.
It doesn't surprise me one bit Yahoo gave the CIA the key to the back door, it would surprise me to the point of me being utterly confused if it turned out not all big email providers are in some deal or another with their favourite agency.
Still, just because it rhymes: Yahoo! Yahoo! You big wazoo!
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