> So I guess the question is why isn't this available in many other places? The technology has been available for a long time

This is ubiquitous in even small Canadian cities, like Thunder Bay and Sault, though it often comes through a partnership with the Transit app (which I have complex feelings about -- the ubiquity is nice, but having a publicly-funded option would be better, and I question whether Transit is doing anything underhanded with usage data; the app has a paid plan, but it's plenty usable without it).

I live in a bigger city (Toronto), and speaking from experience, locations tend to be accurate to within a minute or so on most routes, and the app does a good job of telling you about route changes due to maintenance or detours due to construction.

Pre-Transit, Ottawa -- a medium-sized city in its own right -- had a system where you'd text a service your bus stop number and it'd give you the next bus's estimated next pass at that stop; I know that early on, that just did a lookup of the static bus schedule, but I believe it eventually started using live location data (though by that time I was using early versions of Transit anyway).

The US has this problem where transit gets continuously underfunded and people then act surprised when it's sub par. Canadian transit needs a lot of love, but US transit's consistently been some of the worst I've ever had to use.