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True, but I think part of the point is that the GTFS data is subject to the technical competency of your local transit agency, and that seems to vary widely— sometimes they lie about where vehicles are, or pretend that schedule-inferred positions are GPS positions, or they're missing vehicles, or the data is delayed, or whatever.

When Transit captures this information from their own users, it's much more trustable— basically all they'd have to watch for is someone maliciously poisoning the data by telling the app they're on a bus when they're really in a car, but that would be a lot of effort to go to just to be a jerk and end up shadowbanned.



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