A commonly cited reason for Web3 is that centralized systems (government, banking) are broken and decentralized systems are the way forward (blockchains, cryptocurrencies). The problem is that fully decentralized systems have all sorts of issues in the same way that, for example, truly free markets do—exploitation, theft, perverse incentives, and so on. As such, engineering solutions can only go so far and are doomed to rediscover the need for hierarchical regulation to make it work.
Read 100 years of whatever this will be from apenwarr.
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One issue with decentralized systems is that, from the onset, such systems are most appealing to outcasts of other systems. These outcast groups are more extreme (political views, illicit activity) than those using mainstream systems. This can be an impediment to development and growth of a network.
The unifying desire to make money through speculation is what will make Web3 successful.