Earlier quoted context omitted.
To combat your pessimism - I would point to podcasts. In general, these were distributed on free platforms. The content became profitable through sponsorships. That is, the content creator does a deal directly with a brand to include a spot within the content read out by the presenter. So, there is a clear and well-trodden path to monetization for content creators even on free distribution platforms. Of course, as an…
I don't have data about how common various podcast monetizing techniques are, but my impression is that it's quite common for the podcast hosting provider to inject ads into the audio file at download time , enabling them to target ads based on the downloader's IP address or whatever other information they have about the downloader.
Dominant (tech) podcasts seem to favour focus on production, not distribution. Spotify went in guns ablaze and mostly failed. Personally targeting outside walled gardens often misses basic stuff like ads in a matching language. Content catalogue is billboard-irrelevant class. Nothing remotely near classic product placement or creator curated ads.