I've build my own tile server map with mapbox gl spec, thx to them, with simple osm features, data about transportation is fair enough to get some basic calcul

I've build my own tile server map with mapbox gl spec, thx to them, with simple osm features, data about transportation is fair enough to get some basic calculation features, i mean it's a good start, Google maps pricing is insane, if u plan to support thousands of users like us this gonna kill your profitability, we have no money to invest for that part and imo u should be vendor less if u want to develop ur activity til u buisness model works at least