Here is the but: imagine someone were to publish a story set in your universe where suddenly the nazis took over and everyone liked it.
This is an extreme point, but it's one reason not to allow everyone to use your trademark without prior asking. Because maybe you're not okay with that AND suddenly your a bit famous works are in the same pot with something you wouldn't touch with a 10 foot pole aaaand your sales go down.
Today's outrage culture could cancel you, even if you did nothing wrong.
In a better universe I am all with you and I personally would feel honored and flattered if other people would use my created worlds for their works