We are talking here about the (net) profit margin, not the operating margin. The link you gives confirms the net margin is 19%. Please delete or edit the unfounded personal attack in your comment, as it is uncivil and inappropriate for this forum.
You are confusing the parent company with the publishing part for that 19%, which is the main subject here. You are uninformed.
The www was quite literally designed for sharing scientific papers. Hosting them is a 1990s problem. The real cost is in building a paywall and enforcing it