Point being FM coverage is almost universal in any area where there’s a significant number of people, not just lone homesteaders, uncontacted tribes, suchlike. Yes there may be people there that could be reached but the total number is small and if they want any news, they’re getting them from the town over once a month.

Contrast that to the situation when those shortwave broadcasts were originally set up where you had whole cities with actual population that had no electricity, no radio, and certainly no internet. You’ll still find settlements like that, but, as said, not a large amount of people. Alternatively, people behind the iron curtain: You don’t need short-wave to get into North Korea and any Chinese or Russian who cares can access any western media, anyway.

The purpose of these broadcasts isn’t “play some music to 20 evangelical homesteaders 100km away from the next road”. Those people aren’t the kind of people who might, one day, protest in front of the president’s palace.