It's not really up to the submitters. One of the core guidelines of HN is to use the articles title and not to editorialize [0]

>[otherwise] please use the original title, unless it is misleading or linkbait; don't editorialize.

[0] https://news.ycombinator.com/newsguidelines.html

Obviously there are upsides and downsides to this, but IMO it significantly cuts down on clickbaity titles at the expense of some readability when the site being linked to chooses a less-than-descriptive title.