...and strangely, even quality sites like HN take the given headline instead of the lede. Some subreddits have a way to indicate 'misleading headline' – could be a great feature across all consolidators/curatorial social media.

The mods here do sometimes change sufficiently misleading headlines, but that takes time and getting their attention.

Which is good, but it almost feels like it should be a UX convention at this point. Of course, that'll be abused as well. Remember eTrust badges? :'D