In the realm of music, I think the mainstream has stayed roughly the same size but the rest of music has exploded in size and variety via Spotify/Bandcamp/Soundcloud/YouTube.

Instead of zines there's a million or so blogs and forums and newsletters.

Podcasts are an entirely new realm and only a tiny sliver of it cracks the mainstream.

The number of outlets for "TV shows" has exploded, so there's plenty that comes and goes without any significant mainstream exposure.

Much of the above is created on an enthusiasts budget for a tiny audience.

And I'd argue a lot of the above are exempt from "cancel culture" if only because most people don't know they exist.