Or I ask to go to Costco, and where Assistant previously would route me to the nearest one, Gemini sends me to one 80 miles away

Fortunately, at the farmers market, you can usually look up the farmer. Eg, visit once or twice just observing, seeing who gets visited by regulars, Google the farm name to look up details and reviews, etc

Many supermarkets are enshittifying/rent seeking too though

And drink verification can

Yes, this is the problem. Not much choice, and most of the corporate ones are moving to various shitty practices. Oddly enough, many of the big corporate chains are now closing locations en masse, such as Rite Aid

Some stores have started requiring the app to get your prescription. Happened to me. They actually made me install the app before they would fill my Rx. I stopped using that store and went to another neighborhood.