Turns out, marginalized and minority communities, counter-intuitively, tend to prefer it the most.
As for tracking chip -- we don't do it at birth, because we don't need to. Most people over the age of 15 keep a cell phone on them which provides tracking capability / cellular triangulation. It's used to save lives and apprehend criminals constantly. The privacy issues are actually more marketing based and have nothing to do with the GPS / triangulation issues, and people don't want to solve those, unfortunately.