DG does not block anyone.
Actually, it has nothing to do with where you live, except what “hops” you need to make through hand-offs in the Internet maze.
I have not checked recently, but the last I looked, the Tomnod platform was presented through the NW USA (Oregon, I believe). I’m in NE USA, so my Internet provider was sending me EAST before “hopping” around the country on the way to that major hub in the NW US. (I noticed a cloudnet address but have not looked to see if Tn changed anything on their end.)
Popular campaigns often run slower. Campaigns with high # of tags can become very slow.
Even in the US, I often Nod after 1am Eastern time through 6 am Eastern. Most US people are sleeping then, plus the DG employees aren’t doing work on the images.
I know it can be frustrating. Hang in there.