Busses without the poor people seems to be an American dream. In Australia and London it's "acceptable" to ride the bus, but in The Bay Area at least it seemed to be for "weirdos" only.

TFl has the data and City Mapper use a lot of it but with their own additional heuristics.

Anyone can write an app that consumes the data. https://api.tfl.gov.uk/

Nobody's buying, I'd imagine.