I was involved with picking a candidate for an internship in 1999, we had three candidates and they all mentioned basketball on their resumes. I think it's just something to help the resume fill one page. And help provide a direction for a 'validate the resume' interview.

Sometimes, if the hobby shows leadership etc, it might be relevant even if the domain isn't.

I have a one-liner in my resumé that lists "interests." basketball, baseball, photography, music, the outdoors, privacy and digital human rights. With the heading, it takes up half an inch of paper on the second page, which I only provide in a PDF.

If anything in there is a disqualifier, I don't want to work for you anyway. If you need any more info than that, ditto.

Especially in recent graduate positions. I maybe won't make sense if the interviewee was 35 but if they're 21 there's just nothing else to talk about. That said, at least in software, the right answer still includes something about coding or building things.