Fantasy books, stories, ＆c

Caveat: this is not a good explanation, and deliberately avoids most of the nuance.

WOTC licensed the core rules for 5e (a small fraction of what's contained within the player's handbook) in a way that allowed third-parties to release content designed for 5e. Then they changed the licence in a way that would require every third-party to pay them significant royalties. They said it wasn't released and they were gathering feedback, but they were also telling people to sign it. It seems to be a money-grab by the parent company Hasbro (which also owns Magic the Gathering).

Paizo came out with the ORC licence which is held by a trust, is irrevocable, and has community support.

I'm probably wrong about what they're talking about, but they made some changes in their push to essentially kill off old content. Sword coast or bust, but they've been pushing their world since 3rd edition.