It makes the landscape competitive. There isn't really a notion of "moving" to a "platform". It's more like if Twitter sucks, some team can spin out an alternative that has the existing content but takes different product decisions. And then some people can try this alternative and use it without leaving the existing network. So, it allows more experimentation in the market without having to solve the cold start problem. The lifecycle of products becomes more fluid. It's easy to spin something up, and you can also shut things down without permanently killing them.