Network effects have a certain amount of unpredictability. A highly political group split off from X to BSky, and, imo, gave the network an extra amount of escape velocity. We're seeing a receding, but it did show X's network effect wasn't almighty. BSky will be better prepared for a next wave, wherever that may come from.

I don't think any of us can predict how this will play out, but it certainly is interesting to watch the user growth/receding and watch the waves.