This is such an HN comment, it bothers on the cliche.
Apple has generated more Airpods revenue this year than Nvidia has period. Apple has generated 2x Airpods revenue than ALL of AMD or Square or Spotify. Just Airpods. It's 5% of their revenue (and these are $129 devices competing with $1000+ devices in their portfolio for the revenue pie).
How is a product that generated $12B in revenue in one year niche? I'd take that niche. Literally every person on the street has them in their ears. Imagine a startup with $12B in revenue and >120% YoY growth and margins in the 50%.
I'd argue Airpods might be the second most successful Apple product ever after the iPhone.