A large chunk of people turn off/change the station on anything they don't like, which may be because of even slight unfamiliarity. I remember myself being this way when very young. Even today playlist radios sometimes have popular tracks in the format that I really hate, and this can also cause me to switch. This is even worse if that track is sure to be played 10+ times a day...

Anyway, this unfamiliarity switching is presumably a big deal for profit. Also, if you switch to a station and you're not hooked, this is also a problem: and a for-profit radio will irritate new listeners anyway with ads. There's a cycle in my local area (in Europe) of radio stations that were a little more adventurous, even formed with staff leaving from somewhere else. They end up again and again folding or even bought out by the same boring format radio they had left. Presumably, advertisers don't like them based on the stats etc.

People are right that this is an old problem by now. In 1990s-2000s that soulless commercialism of old media even contributed to popularity of the internet, when ironically that was the alternative place.

And now for quite some time we have people presenting avoiding challenging the user in slightest beneficial ways as some sort of moral argument. So to be clear, I also think this dynamic is bad.