It's fairly commensurate with any license. DTRPG takes 35% of any sale. So you're paying WotC 15% to play with their IP (albeit in a very restricted manner).
People expectations of what they think they writers get confounds me sometimes. Ordinarily, game designers get a one-time work for hire shot at something, though royalties are becoming thing, they are close to 10% or less.
A novelist gets 15% royalties of which his agent gets a cut. The other 85% goes to the publisher. And that's only after the advance pays out.
A newspaper journalist, sees nada when a newspaper sells a reprint of a story while photographer gets a cut of every photo resold (mostly because the photographer keeps their own negatives.)
Outside of Kindle self-publishing or Patreon, community content is about the best deal a writer can get.
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