Sure. But also some of my favorite media is podcasts, and many of these exist because of the low barrier to entry. Eg:

Econtalk - a hypernerdy, super in-depth, and sometimes winding and verbose semi-academic economics podcast that sometimes dips into poetry, philosophy, political science, and anthropology.

Hardcore History - Dan Carlin’s much-acclaimed history podcast where he gives book-length lectures on gruesome historical events.

The Power Company Podcast - a podcast exclusively about training for rock climbing

There’s no way any of these shows would have been syndicated on old radio stations. But the freedom of podcasting let them create something awesome and find their niche audience.