The technical underpinnings are so terrible that it is clear they exist only to hype the underlying cryptocurrencies. The actual utility of these "decentralized" systems is already available in modern distributed systems in ways that are several orders of magnitude more efficient and more capable. [...]
So what does the supposed "web3" add to this vision? The cryptocurrency web3 starts with all our existing infrastructure. So I still need a DNS name, I still need a server, I still need storage, and I still have a distributed computation occurring between the browser and the server. So already I haven't removed any of the gatekeepers from the conventional distributed system, showing the claims of gatekeeper-free decentralization are false.
Web3 is only about adding an additional layer of complexity in the name of justifying the underlying cryptocurrencies. The web browser is augmented with a cryptocurrency wallet and part of the computation and storage is shifted from my server to the decentralized cryptocurrency infrastructure. [...]
So why this hype? Because the cryptocurrency space, at heart, is simply a giant ponzi scheme where the only way early participants make money is if there are further suckers entering the space. The only "utility" for a cryptocurrency (outside criminal transactions and financial frauds) is what someone else will pay for it and anything to pretend a possible real-word utility exists to help find new suckers.
After all, a programmer doing the most basic test of a web3 prototype is going to need to get the cryptocurrency, spend the cryptocurrency, and any application will require all users to get the cryptocurrency as well. If this gets abandoned quickly due to the inevitable technical failure "web3" still accomplished its goal of getting more suckers in and extracting their money.
So in the end web3 is a con job, a technological edifice that is beyond useless as anyone who attempts to deploy a real application will quickly discover.
Of course, Mozilla says, "Decentralized web technology continues to be an important area for us to explore."