"move away" is a tenuous assertion. If someone puts the majority of new content on another platform, is that "moving away"? What if they only use the old platform once a week? What if they only use the new platform once a week, but that's when an important discussion happens?

No one moved away from email.

> If someone puts the majority of new content on another platform, is that "moving away"?

yes.

> What if they only use the old platform once a week? What if they only use the new platform once a week, but that's when an important discussion happens?

you’re describing low usage.

My point is that it's still the network effect, even when the old platform still has active users.

Nobody left email, yet the network effect is still very present in that space.