It's good for everyone that DDG usage is increasing, however, the lack of any kinks, sudden slope increases in the graph tells me weren't any particular set of events that caused people to switch. Rather, they got "fed up with google" at their own pace, and it wasn't any one particular thing that Google did that caused a mass exodus.

That's sad, really, because it means people as a large group don't care about any particular anti-privacy thing that Google did. I would be interesting to see in a few months whether the current Chrome fiasco will have had any effect, but I doubt it.