I’d be cautious with saying evolutionary advantage here.

I don’t believe the “Gay Uncle hypothesis” any more than the somewhat debunked “Grandmother Hypothesis”, which aimed to explain menopause with biological altruism. Just because we could think of a way in that it might be advantageous for a species doesn’t mean it’s advantageous for an individuals fitness.

Of course, it can be still an advantage, but we’d only know with more free, uncensored research.