Rent Extraction is the objective, and I partly disagree that killing the secondary market is the blanket objective. Look at ticketmaster. They sell the tickets, then they also take fees on the resale of those same tickets purchased by customers/scalpers. They profit twice thanks to the secondary market. Doesn’t work (yet) for something like books, but give it time.

The general objective is to force everything to subscription and also force upgrades thanks to them controlling EOL for everything. They never want to give users the ability to run their own servers for sunsetted services.