A couple days ago, the Association for Computing Machinery (ACM) sent an email to its members informing them that the O’Reilly publishing platform was ending their longstanding licensing agreement. This agreement allowed ACM members to access online O’Reilly content. Since an ACM yearly membership is roughly 1/5 the price of an annual O’Reilly subscription, you can see why the ACM membership was so valuable, and why it was in O’Reilly’s best interest to cancel.