As an example, consider domains.
Ethereum Name Service domains are currently one of the most popular. If you use these domains, you instantly have access to the 10,000,000 people using MetaMask, and the 50,000,000 people using Brave Browser. They're actually very powerful when considering the centralization of normal domains.
They allow you to create decentralized domains that are
- Easy to remember
These are better than onions because they're easy to remember. There's no centralized host that can try to change the address to trick other people.
- Censorship resistant
I don't think people here are unaware of how domain seizures have impacted services. The domains are controlled by records on a blockchain.
- Controllable by a single person or smart contract
Domains are controlled by private keys or smart contracts. A small group of 10 people could democratically control a domain when they don't trust each other. A DAO could control vote out the CEO that controls where a domain points, and elect a new CEO. There's lots of use cases here.
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I could write more, but I'm just trying to show that it provides use cases that Web2 does not currently.