I don’t know how common it is, but I don’t think it's rare. Again, it might be a lower percentage in New York, but it probably still happens more than you'd think. You'd be surprised how many people don’t even know how to set a preset (my mother among them).
That is an interesting observation. Many years ago when I had a bunch of stations in Ecuador, we had a street crew (actually one guy part time) who went to taxi stands and bus terminals and offered prizes if we could set two buttons on the car radio to our "popular class" stations. We'd give things like gallons of motor oil, coupons for gas stations, etc. The city had 31 bus routes, each with a station at each end. And maybe 100 taxi stands... perhaps more. So every day, he could hit 25 to 50 taxis in an hour or two and as many as a dozen of the small, medium and large busses. We also got them to allow us to put decals in the vehicle windows.
A lot of the drivers did not know how to set the radio. We were "kind enough" to set for other favorite stations that were not direct competitors.
I tend to agree with you here. Whether it's a TV and outdoor campaign or something else, just existing probably isn’t enough. “If you build it, they will come” hasn’t been true in radio for at least the last 10 years.
It's seldom true unless a station does something to fill a huge hole in a market. When I did the Mega "Rock Nacional" format for Emmis in Argentina, we soft launched and had no promotion ready. But we were the only Argentine rock station, and we had found that as many as a third of all adults would cume it. In the first book, after less than a month on the air, it was #1 with nearly a 19 share.
At that time, there was no widespread internet usage. There was no streaming, and no smartphones. It was 2000, mnot 2025.
We launched Mega at about 11 AM on a Tuesday. When we were too tired to do any more, we went to dinner (restaurants open at 9 PM generally) and grabbed a taxi. The driver was listening, less than 12 hours after the launch. We asked, and he said another driver had discovered the station and spread the word. The station "went viral" in a single day with just word of mouth.