Good question ! That could be a simple BTC association wanting to promote the BTC. A bit like Fountain or Blink giving few sats to incentive you to learn BTC. But yes, for a car GPS it's different. Or simply seeing ads and being paid in Sats in exchange. I would prefer see ads and be paid in Sats (Brave model) than just seeing ads to let us use an app free.
Pulling from both OpenStreetMap and BitcoinMap would be cool, especially if there was a way to add info, reviews and an option to open a geo-tag so bitcoiners can high-five and zap each other face to face.