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I'm surprised no one mentioned IRC as an analogy. Much more sturdy than a web server.

And this is not, as the article says, a blockchain issue. This will only succeed if they join specific, already popular/widely used, blockchains (bitcoin and ethereum come to mind).

If they join some little known blockchain they may get blocked. In a way they're leveraging the somewhat implicit "too big to kill" nature of the big two blockchain instances.