My innocuous scholarly website, http://brannerchinese.com, was blocked for a number of years from Chinese locations, which made me think I was being singled out for some reason. A couple of months ago someone told me it was now accessible. Had I really been rehabilitated?
I think a lot of the blocking is done by people of very low decision-making authority who have been placed fortuitously in a position of power — often high school and college students working for pennies.
So maybe it doesn't mean much — isn't being done by people answering to a political authority, just by low-level functionaries trying to look busy.