For relatively static info, sure. For real time bus/rail status you need integrations to countless public transit systems. For stuff like store times, etc, you need sufficient market power so that business owners are incentived to provide that info.
> business owners are incentived to provide that info.
Business owners usually provide it on their door. I added opening hours to many places, and importantly I didn't have to add opening hours to many other because they already had them.
> For real time bus/rail status you need integrations to countless public transit systems.
For public transportation, I personally usually need to buy a ticket, which Google Maps doesn't provide. So I use the public transportation app of the country in question. For countries where public transportation are public, which usually implies an app, of course. Countries that have broken public transportation won't work the same, but anyway the public transportation is broken there :-).
Maybe this is a cultural difference, but in my city opening hours are pretty stable. Sometimes they're even engraved in the store sign. There are exceptions though.
