All navigation apps that are built on osm have awful routing, particularly with public transport, they are almost useless. That's without taking the missing data into account (shops, opening times, basically zero reviews, etc..)

It's all user submitted. It takes someone caring enough to fix it, to make it work. Check out StreetComplete, Every Door, Vespucci, and/or CoMaps to help add/fix data

Uber and Lyft are built on OSM.