In addition, rock music fans seem to be more likely to get their music from streaming than OTA radio. Not just because the format is not available. But when it IS available, they want to have more control over the music that gets played. Rock fans are more focused on specific artists than a genre as a whole. That is very unlike formats like country or urban, where listeners are more driven by the format than specific artists. This is not to say they don't have their favorites, but that they are more tolerant than rock fans. That is a key difference.
Satellite radio has also focused on rock listeners since its inception. Rock is the single biggest category on SiriusXM, a whopping 23 channels, including single-artist or artist-"curated" channels for the Beatles, Bruce Springsteen, the Grateful Dead, Elvis Presley, Pearl Jam, Jimmy Buffett and Tom Petty. New rock can be heard eight on channels, splintered into as many styles. I'm sure all these channels as a group attract many subscribers, but the numbers for each channel are likely underwhelming. Such is the state of rock today, sadly.