I was working at Google when it came out, and that they were tapping our private inter-dc links was a huge update. Before I think it was something like "I guess the NSA could do that a bit, but it would be a prohibitively costly to do much" and then suddenly it was "we have to encrypt all of this as quickly as we can". There was a huge internal reprioritization.

(Speaking only for myself; I didn't work on any of this directly)