I think the fault is ultimately on the side of the editors: if the researchers put spectacular titles that do not correspond to the reality of the text (leaving aside all the criticisms that can be made to this practice), the duty of the editors (and reviewers) is correcting such errors.
Yes, the responsibility lies primarily on the authors themselves and then on the editors. If the editors make any undesirable change in the title, the authors should strongly object. You go through my profile and you will find such an example. I attended a workshop and when the paper was published I found that the editors have changed the title in order to make it attractive without my knowledge. However, the text was not matching with the title. I have pointed it out in RG.
Editors and authors in particular are to be blamed. Editors must ensure rigorous peer reviewing systems are at work (qualified experts). They would be able to expose the folly of researchers who use grandiose titles to win others over only for them to realise the emptiness in their so called excellent studies via deceptive titles!