It is good to remind people of the nature of legal enforcement which will essentially be required in such cases, but 'illegal stuff' is definitely not the only use case.
For example - banks could feasibly use blockchain for clearing trades.
Right now there is a 'single point of trust' for such things which even financial institutions want to break out of.
Blockchain could theoretically enable distributed exchanges.
The 'rule of law' is still essential in that context, but blockchain could work there.
This is only one example of 'regular real world use'.
FYI / caveat: the 'hardest part' about getting these more distributed systems going is getting large financial entities to agree on the nature of the exchange, and hammering out of the real world details. At that point, blockchain becomes a secondary and not necessarily essential component.
For example - banks could feasibly use blockchain for clearing trades.
Right now there is a 'single point of trust' for such things which even financial institutions want to break out of.
Blockchain could theoretically enable distributed exchanges.
The 'rule of law' is still essential in that context, but blockchain could work there.
This is only one example of 'regular real world use'.
FYI / caveat: the 'hardest part' about getting these more distributed systems going is getting large financial entities to agree on the nature of the exchange, and hammering out of the real world details. At that point, blockchain becomes a secondary and not necessarily essential component.