WMATA/Transit Service #2: Why don't metropolitan areas with multiple agencies create one combined scorecard?

Larger transit authorities, like WMATA or MBTA in Boston, tend to provide information on boardings by transit station for fixed rail, and by bus line.

Many of the area agencies provide various forms of ridership data, but usually it isn't broken down by line.  It's mostly aggregated by month.  It definitely isn't amalgamated into one combined site.

Graphic from Philadelphia.

That could be one of the duties of a metropolitan focused "Sustainable Mobility Advocacy Campaign" for the DC metropolitan area.

This data, but aggregated, is reported to the National Transit Database.

The American Public Transportation Association publishes quarterly reports using this data, for the major transit agencies across the nation, by mode (railroad, subway, light rail, bus, trolley bus).

This graphic was produced by an advocate, based on data made available by the Toronto Transit Commission.  Red lines show higher ridership.