Lets say a method to store arbitrary content in a distributed fashion that is permanent and optionally private (encrypted, with the ability to share). I think all of them have this, but the encryption/sharing abilities vary (i.e. you may have to roll your own).
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"Use a distributed web platform" is not a goal, it's a means to a goal.
What are you trying to achieve? What is your goal? What would success look like?
Lets say a method to store arbitrary content in a distributed fashion that is permanent and optionally private (encrypted, with the ability to share). I think all of them have this, but the encryption/sharing abilities vary (i.e. you may have to roll your own).