I'm assuming that third parties are a lot more likely to join an external channel on a platform they're already using (and are more likely to be responsive as w

I'm assuming that third parties are a lot more likely to join an external channel on a platform they're already using (and are more likely to be responsive as well). I think all the existing integration are examples of an indirect network effect -- companies wouldn't invest in providing them if there weren't already users on the platform.