I love Google maps but I don't think Google has any edge over other map services in transit API integration (partly because of what they did).
Pretty much every major transit agency publishes their schedule in two standard formats these days: GTFS for static scheduled and GTFS real-time for real-timr info. The G used to stand for Google before it was generally adapted and now it stands for general. All apps use the same data for showing transit feeds.
There are some exceptions, such as cities where the transit agency has an exclusive agreement with Google maps but that's becoming there.
There's a niche area where some apps focus solely on transit, adding a lot more data or integrating non standard custom APIs. Transit (which I love, sick UI) https://transitapp.com/ and CityMapper are two of them.
Pretty much every major transit agency publishes their schedule in two standard formats these days: GTFS for static scheduled and GTFS real-time for real-timr info. The G used to stand for Google before it was generally adapted and now it stands for general. All apps use the same data for showing transit feeds.
There are some exceptions, such as cities where the transit agency has an exclusive agreement with Google maps but that's becoming there.
There's a niche area where some apps focus solely on transit, adding a lot more data or integrating non standard custom APIs. Transit (which I love, sick UI) https://transitapp.com/ and CityMapper are two of them.