Somebody needs to figure out how to move millions of people from one platform to other. Otherwise we will never get better platforms and our current techlords will keep getting richer.
In the early days of social media it was a standard that you could get your lists of friends, etc out and then use them to bootstrap your social network on new social media. All the big players like Twitter and Facebook took advantage of that and then locked down their own platforms to make it hard for you to move your social network out of them.