Many restaurants don't have a website anymore. Yes, you can google for directions and opening times, but you can find menu or daily lunch on their Facebook only.
does a google search find data that might be visible in google maps?
I'm not sure if Google put a stop to it, but in my area there was an issue about 6-8 months ago with the business hours listed on Google being changed by competitors. Usually they would alter opening or closing hours by an hour or two, so it wasn't obvious.