"but how?? did a decentralized service?? go down??", well you see, scale-free networks are robust to failure yet vulnerable to attack, while flat networks are robust to attack yet vulnerable to failure. choose your fighter.
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Systems that survive find an efficient frontier between robustness to failure vs attack given the evolutionary pressures of the environment. These pressures and network effect are what define the exponent of the degree distribution of hubs.
While this is a bit over-simplified, this is indeed a general observed tendency. However, there are more factors to optimize for, such as optimality of transport.
Well tbh even Barabasi doesn't go in depth enough. It's still a very active research about balance act between vulnerability, fragility, and such. But yes it's crucial to think in this manner (esp the degree distribution) when it comes to decentralized systems
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