In fact, some of Google's traffic data is based off things like police reports.
Unfortunately, I haven't been able to find one for walking around. All the battery powered ones seem aimed at hikers, so they're loaded with great wilderness maps, but won't help me find a coffee.
I'm willing to pay a fee for many things but these three services redefined the entire world's productivity levels. Maps, Search and Wikipedia are world-changing (and miraculously, Wikipedia is a non-profit and still manages to exist and be stable. Please donate if you have the means, etc.). The reason they are world-changing is because they're free.
Free: Available to everyone, everywhere, without payment or account gating. It's a huge fucking deal for the world that they are and remain free.
You want to change the world? Make something massively useful to the planet. Then, make it free.
However, there are FOSS and privacy respecting alternatives, most are based upon OpenStreetMap - wikipedia style map of the world. Some data is still lacking, but at least you yourself can fix it if you want to.