PR. Radio stations have done that for a long time. I'm referring here to actual over-the-air programming.
Serving the public is more than running a talk show at 5AM Sunday morning. Yes serving the public is good PR.
Meanwhile it's up to the FCC to represent the public. If they feel a station isn't serving the public, they can send them a violation. How many iHeart stations have received FCC violations about serving the public? You're welcome to have an opinion, but I'm asking you to provide examples.