As it happens, I’m familiar with your neighborhood (hello, fellow Oaklander!) and can tell you that during its very low income years North Oakland also had a fairly high student population. Which could well explain the number of Ingress portals.
West Oakland (high majority black for several decades, now undergoing gentrification) didn’t have a high student population, so it would be interesting to see whether it has Ingress portals. Not conclusive, of course, but certainly suggestive.
