1) Finance (DeFi). Even for valid (non-criminal) uses cases, there are numerous laws and regulations that translate into crazy fees to do proper crossboder money transfer. I transfer money every month from the US to different countries in LATAM to pay employees, and historically you get screwed with various fees depending on how you structure the transfer (e.g. to the employee directly vs. to an entity in the receiving country that disburses the money to different local employees).
During the past few years I have encountered everything:
- unexpected fees beyond the local transfer fee at the receiving end (that change some times) (hello folks at Interbank!)
- low-fee provider that canceled our account because the TOS said that the service was meant to be used to send money to family and not to employees (hello folks at Xoom!)
- holding of money transferred for a week because of some threshold passed that triggered some AML check (hello folks at BCP!)
- provider that canceled transfer to a particular country for political instability (hello folks at Transferwise!)
- etc etc
All that goes away when you use p2p networks (like the ones from Binance https://p2p.binance.com/en?fiat=CNY&payment=ALL) and stablecoins to transfer money. The fees are low (or sometimes non-existent) and the transfer happens in seconds (vs the hours/days in a traditional system). Literally millions of cross-border dollars get transferred this way every day. Additionally, I hear of other folks who have escaped authoritarian regimes but still have family in those countries where there are strict restrictions to send/receive money. Guess what they are using?
2) Digital Property/Rights: Whether you want to accept it or not, there is an entire market where all kinds of property is being transferred through smart contracts. Sometimes the traditional digital item (say an NFT) has an associated real-world contract attached to it that extends some sort of right/ownership of a physical item in the real world. The rights to these items is being transferred from person to person every day. That market keeps growing, and it is not just "exchanging jpegs" anymore.
For both of these use cases, there are real world scenarios where a central authority has been by-passed for a legitimate transaction. And it happens every day today. The use cases for web3 is not running a "distributed Wordpress instance", but other useful real-world use-cases like these that we are starting to discover.