What public interest obligations, you say? But they do exist and recently the FCC has gone as far as to suggest that they may be a bit more stringently enforced. Here is the updated and revised manual explaining the obligations of broadcasters.
The FCC has also created “information specialists” who are available to help members of the public understand broadcast license renewal. Here’s the contact info if there is something you would like to understand (or make understood). Radio department: Toll-free (866)-9267-7202 TTY (877)-479-1433 FAX (202) 418-1411 firstname.lastname@example.org. TV department (866)-918-5777
TTY (866)-787-6222 FAX (202)-418-2827 email@example.com