Argyle King
Legend
Every single D&D book is tied to the movie. That's the brand choice they made and it's fueling strong search, strong sales, strong licensing and strong merch.
There's mediocre box office, for a multitude of reasons.
I suppose you could argue that the books are tied to the movie.
I'm questioning what the movie has done to increase the visibility and/or understanding of the game.
In comparison, the Dragonlance books were directly responsible for me becoming aware of what D&D was. I read them without having any idea that D&D existed. At the back of one of the books was an advertisement (and a small blurb) about D&D.
Recently, yes, there were some clips of the cast playing the game, but it still seemed like something of an afterthought rather than a coherent marketing direction.
Likewise, attempts to capitalize on brand awareness brought forward by shows such as Big Bang Theory and Stranger Things were (by my own perception) slow to manifest.
(And, oddly, I found that the Rick & Morty Starter Set was a far better product than the Stranger Things Set.)
Maybe I'm completely wrong. It could very well be that a large portion of the movie audience is now going hogwild over mimic plushies and playing D&D. If so, that's fantastic. Currently, I'm not seeing that.