In my experience it's a common mistake of non-native English speakers, of native speakers of Slavic languages in particular. I see it often at work with titles starting with an interrogative word like "how".

Guaranteed this is the case, I see it a lot too. They've done it twice before on previous submissions: https://news.ycombinator.com/item?id=44755116 and https://news.ycombinator.com/item?id=44785347

In case anyone is curious, the way to phrase it as a question would be, "How does randomness improve algorithms?"

Weirdly, "Why randomness improves Algorithms." Is closer to the truth and also cannot be expressed correctly with a question mark.

Indeed. Well, FWIW, the title translated into my native Slavic language would also make no sense with a question mark.

What's interesting is that both How... and How does... would translate into the same words but with a dot or a question mark at the end it would mean two different things.

That said, that would be true for many languages.

It’s not there in the original title.

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