Google Maps ingests public data feeds that anybody can use and many other transit aggregators do use: https://developers.google.com/transit/gtfs https://develop

Google Maps ingests public data feeds that anybody can use and many other transit aggregators do use: https://developers.google.com/transit/gtfs https://developers.google.com/transit/gtfs This is much the same as AMP, which any link aggregator can use and many link aggregators do use, and dissimilar to something like Apple News API, which requires direct integration with Apple.