…him complaining about Amazon's reader app making it too easy to buy books without paying the (increasingly literal) Apple Tax.

Heh. Attempting to buy a book from the Kindle app was how I first became aware of these policies. Was fruitlessly searching for a buy button, but could not find anything. Did a web search to figure out why I was an idiot who could not spend my money. Only to discover that I was purposely getting a worse user experience because some mega corporations all wanted a taste of my transaction.