Watched the same thing happen to my hometown paper's page over the past couple years. Used to figure it was just folks getting bored or moving to other apps, but then I actually looked at what changed. The paper turned off comments on anything even slightly heated, and the few threads left were filled with the same five people copy pasting the same takes. So yeah, the reply counts tanked, but it wasn't some mystery. People stop showing up when the room feels dead or rigged. My view flipped once I saw it up close. It's less about people losing interest and more about them deciding it isn't worth the hassle anymore.