As I said in a comment elsewhere: In the movie Field of Dreams, the ghost voice says "If you build it, they will come.", but fails to say "Oh yeah, you have to look after it once you've done that. You're gonna need a ride-on mower."
During various exoduses[1] from other social media platforms, people excitedly created accounts and also attempted to re-create the places, magazines as they're called here, that they were familiar with. And then they didn't want to post content in those communities, nor did they want to have to manage them, because they hadn't done that elsewhere.
They expected the content to magically appear as it had done in those other places.
When it did not, they went elsewhere or perhaps back whence they came.
While I am very much guilty of expecting the magical appearance of posts, I can live with what's available here, and Federated from other places. I was self-aware enough to not create any magazines, though. I do not want to buy that mower.
[1]: Exodi would be the Latinate plural. Exodoi would be the Greek. You may now relax.