Apple will continue to offer a 7 percent commission rate for all other iTunes content, including music, movies, TV shows, and books. Apple will also continue to offer a one-time 50 percent commission on Apple Music subscriptions.
Ouch! Apple just slashed the affiliate commission on apps and IAP. This will impact lots of great sites/apps. pic.twitter.com/dbv7CboMX3— David Barnard (@drbarnard) April 24, 2017
Through the iTunes Affiliate Program, websites can link to and promote App Store apps and receive a percentage of the sale in return.
Update: Apple now says the reduced 2.5 percent commission rate only applies to iOS in-app purchases.