Edit: I took out the question mark in response to anigbrowl making the point that it's confusing things:
https://news.ycombinator.com/item?id=34714493.
Edit 2: I've replaced the question mark with quotation marks following a suggestion by bee_rider: https://news.ycombinator.com/item?id=34713987.
-- original comment: --
We sometimes add a question mark when a title makes a dramatic and divisive claim, because otherwise readers who read the title might think that HN (or its admins) are somehow endorsing the claim. We don't know what the truth is and are neither agreeing nor disagreeing with the claim.
Edit: I dug up a few other examples where we've done this:
This is the year of the RSS reader? - https://news.ycombinator.com/item?id=34105572
Anthropology in Ruins? - https://news.ycombinator.com/item?id=34049130
The great Covid and smoking cover-up? - https://news.ycombinator.com/item?id=33869176
The basic idea is that adding a question is a flame retardant because it tends to dampen the meta-comments about the story, e.g. complaints that the admins are taking a side or whatnot.
In this case it's not really working, because the question mark is also generating lots of meta-comments. But maybe fewer than we'd get without it.
Meta comment of my own: it's not only impossible to please everyone with moderation calls like this—it's seemingly impossible to please anyone. That's why it's really helpful to have a first principle to rely on—i.e. to know what you're optimizing for. It occasionally makes it possible to answer an otherwise hard question rather easily.
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...