The signal: Since killing the headphone jack, Apple has graced the world with AirPods, which did an estimated 60m units in 2019. That means AirPods alone are bringing in approx ~$10b in revenue, more than Twitter, Shopify, or Spotify, to name a few popular tech giants. Opportunity lies in Apple opening up SiriOS or the wave of iPhone accessories (including cases, cleaning kits, hooks, and keychains) which have shown “hockey stick” growth alongside their hardware predecessor.