The very fact that comics sales didn't go up with the rise of superhero movies really should say everything about the state of the industry. Shit was broken a long ass time ago, lol
But yeah, anime often helps fuels manga sales and manga sales help anime get made so it's a really good loop when it's working well.
They are different industries.
Anime is generally a straight adaptation of the manga, sometimes with filler eps to add characterisation, sometimes with story missing from the manga. Either way, Straight adaptation.
Super hero movies and shows are not a straight adaptation of the source material, it's impossible to do that since characters have been around for 60-80 years. Even when they do adapt a specific story it's still quite different to the comics.
As an example someone might love the Amazing Spider-Man 2 movie and want to read the comic it's based on. They read the issue and are turned off by the writing styles of 1973, they never read another comic book again.
Or they want to read the start of Spider-Man, X-Men or Avengers, they can't stand to 60's campiness and never read any further comics at all.
Or maybe they hate the 60's and 70's styling but are still willing to try newer comics but they have no one to guide them or make suggestions on where to start. Which issue to start at and what run to read. What TPB or HC/OHC to purchase.
Not a lot of people are willing to read 60's or 70's melodrama and not a lot of people are willing to jump in randomly and use Wikipedia as a catch up guide. Manga does not require you to understand read orders or to look up Wikipedia for information, you start at volume 1 and buy in order, simple.