You are right, unfortunately, he could no more make use of the VPNs. The sites are now upgraded sensitive as he said.Your friend seriously risk to be banned. Cheating on surveys is not the way. The correct is to choose suitable tasks for us. I face the same matters with surveys out of tapresearch and theorem reach because I live in latin America and most surveys are not for us too as not for Africa. So I prefere surveys that pay for disqualifications and partial completion as the mentioned, but I better prefere ptws. I can't do even 50 cents dollar daily doing surveys, but what I can do is better than nothing, as surveys would never be my only task.