As for why they did decide to leave now, they explain that their posts are being viewed by significantly less people now than in the past, so there is basically nobody left to help off the sinking ship any more.
The traffic seems well ranked still. Maybe concerns of algorithmic censorship? As an example, X.com now promotes posts from premium users, and then has an extra promotion mode for premium+ users. (Normal users are now much less visible than premium users)
As for why they did decide to leave now, they explain that their posts are being viewed by significantly less people now than in the past, so there is basically nobody left to help off the sinking ship any more.
The traffic seems well ranked still. Maybe concerns of algorithmic censorship? As an example, X.com now promotes posts from premium users, and then has an extra promotion mode for premium+ users. (Normal users are now much less visible than premium users)