I play Ingress casually. I know people who play it somewhat obsessively, who spend a fair bit of time, energy, and money on strategizing and building community and traveling to anomalies. I’m not in that category. It’s worth noting that it’s possible for me to play casually due to geography (for all that can fall under the umbrella of “geography,” not just actual latitude and longitude).
I live in the suburbs. Some park portals are within walking distance (and I submitted one of those portals; it’s one of several submissions Niantic accepted, back when they were taking player submissions), but my residential subdivision is portal-free. If I had to drive to get to portals, I probably wouldn’t have bothered playing, because it would sort of defeat the purpose. But when I started playing, I was working at the American Philosophical Society. In the Library, a building which is a portal and has another portal screwed into it, with another portal in the garden, and one across the street, and…well, you can’t walk around that part of Philadelphia without tripping over something of historical significance. There are a lot of portals, which became the basis for Pokéstops and Gyms.