I've seen people talk about real debrid forever, and to this day, I've never seen any explanation of just what it is. I've looked it up, and all I found was a generic site with a signup, and the best description I've ever seen anyone use for it is "worth the money."
Edit: No, nevermind, I figured out what it was for. What I couldn't figure out that put me off was the price.
That's what sourcing content is for. All the communities I moderate require sources when possible, and proof of best effort when not.
Your suggestion would make hentai communities all but impossible for the exact reasons you already stated.
Linking only to an art page would make the communities functionally useless. People don't come to follow a million links, open a hundred web pages, and sign up for a dozen services in hopes of seeing something they like, they come to see the content, same as in any IRL content community.
Nude photos are cheap and easy to produce, so those communities would never be starved for content, but a hentai community that only allows direct images if they're OC would be dead on arrival.