It depends where you are. I live in a somewhat rural area in Northern Germany. There are some chargers, but many of them are out of service like the one next door. I've never stumbled upon a free charger though.
Do you not charge at home? I charge at home 99% of the time. I only really need the public infra when I'm going to the big city, or when going on a roadtrip.
I charge with the granny charger at home.