“The DWeb also comes with some significant legal and regulatory risks. It would make policing cybercrime, including online harassment, hate speech and child abuse images, even more difficult because of its lack of central control and access to data. A centralised web helps governments make large corporations enforce rules and laws. In a decentralised web, it wouldn’t even necessarily be clear which country’s laws applied to a particular website, if its content was hosted all around the world. This concern brings us back to debates from the 1990s, when legal scholars were arguing for and against the influence national laws could have on internet regulation. The DWeb essentially reflects the cyber-libertarian views and hopes of the past that the internet can empower ordinary people by breaking down existing power structures.
Decentralised systems also don’t necessarily abolish unequal power structures, but can instead replace one with an another. For instance, Bitcoin works by saving records of financial transactions on a network of computers and is designed to bypass traditional financial institutions and give people greater control over their money. But its critics argue that it has turned into an oligopoly, since a large percentage of Bitcoin wealth is owned by a very small number of people.”
“Web2 refers to the version of the internet most of us know today. An internet dominated by companies that provide services in exchange for your personal data. Web3, in the context of Ethereum, refers to decentralized apps that run on the blockchain. These are apps that allow anyone to participate without monetising their personal data. Web3 benefits Many Web3 developers have chosen to build dapps because of Ethereum’s inherent decentralization: Anyone who is on the network has permission to use the service – or in other words, permission isn’t required. No one can block you or deny you access to the service. Payments are built in via the native token, ether (ETH). Ethereum is turing-complete, meaning you can pretty much program anything”
Source : Web2 vs Web3 | ethereum.org