Exactly. It's a great article, but the depressing part is that there's a very limited catalog of legal media available to use these services with (except for immich, I suppose).

For games, there's GOG. Good luck finding bigger releases.

For music, there's Bandcamp and CDs and vinyl. Fortunately, most albums still release on either one of these.

Audiobookshelf can be used for most podcasts (some do not have a traditional RSS feed and are in some walled garden) and some audio books are available DRM free, but tons of books are Audible exclusives. I'm relatively sure that they also stop authors from publishing e.g. on Royal Road once they're on there.

The same is true for e-books - HumbleBundle and co are great, but good luck finding certain titles. I regret buying a new Kindle, but at least had the foresight to download all my books before they stopped allowing that. Physical books are an option, but that's not an equivalent to en e-book.

I stopped caring about TV shows and movies a long time ago (largely due to the atrocious streaming fragmentation, pricing, and the sheer audacity to include ads in paid plans), but I assume 95% of all shows are exclusive to some streaming giant, too.