It's easy to blame Facebook and Google for this "problem", but on the technical side, nothing has changed that prevents independent creators from setting up their own platforms to distribute their own content. It's as easy as it's ever been to rent some shared hosting, FTP over static HTML files, and start posting links to it around the web. There's still no guaranteed audience, though.
Facebook and Google are only "gatekeepers" to the extent their users treat them as such.
It's dangerous to set up one's own content distribution platform. The moment the media industry will perceive one as a competition or copyright trolls as a profitable target, one'll be torn into pieces.
Sorry, but that's just paranoia and scare mongering.
It's easier than ever for individuals to self distribute their own content. It costs less than $10 a month using Dreamhost (or dozens of others) and PayPal (or Square). Unless it's illegal or highly controversial nobody's going to shut it down.
Facebook and Google are only "gatekeepers" to the extent their users treat them as such.