AFAICT the way Dragonfly utilizing search log to probe Great Fire Wall blacklist and skip them in results was the same way how google.cn (localized Google search in china) worked. That was a smart but arguable approach, Google was heavily criticized to present those "passively censored" results. However, no one from Google at that time did a #walkout or resign for that. Also notably Google did not quit China for the…
At least according to Sergey at the time, the key issue was "opposing censorship and speaking out for the freedom of political dissent". > Brin: I don't think it's a question of taking on China. In fact, I am a great admirer of both China and the Chinese government for the progress they have made. It is really opposing censorship and speaking out for the freedom of political dissent, and that's the key issue from our…
One is that the hack made Google realize it was not a good, stable place to do business, and the other reasons were just a good PR side effect. The other is that the hack gave Google occasion to reevaluate, and they realized being involved in that kind of censorship didn't sit right with them.
I suppose it could also be some of both.