Took the weans a walk away up the back of The Three Towns in Ayrshire where they are installing these big bad boys.
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Helps them chop up birds better
As others have said, mostly about noise reduction. There’s actually work looking whether the same concept could be developed for electric aircraft.
They disrupt the trailing edge eddies - which is what causes any noise - and so make them quieter. They are often fitted in areas where sound might be a particular issue.
So why don’t my CPU/case fans have serrated edges as well? Because they are too small?
Some do, e.g. Noctua: https://noctua.at/en/vortex-control-notches