I wouldn’t even know how to hold a local music library on macOS these days. The app that used to be iTunes is now just called Music right?
Yeah. I have a local library consisting of some albums I bought, some which aren’t on streaming services, and some other stuff such as game soundtracks + also use Apple Music streaming. They complement each other really well.
For iOS, Go Map!! (source) has a similar quests system. I don’t know how well they hold up to StreetComplete though, I’ve never used the latter.
Also, obligatory https://wiki.openstreetmap.org/wiki/How_to_contribute!