I’m not sure if this is true. I use Instagram a lot and the app keeps reminding me that it’s a thing. Whenever I open it I see a lot of content being posted. It does not feel dead.
What's your definition of "a lot of content"? I just logged into it and literally half of my feed was selfies of provocatively dressed women, and the other half was really generic and unfunny memes that I'd expect to see old people posting on facebook (I literally saw the "what color is this dress" image, I am not joking), and almost none of the text was in english. I didn't see a single post that I could say for sure was posted by a real person that was actually using threads.