There are. There are however extremely few use cases for an immutable distributed ledger, which is sadly the other property blockchains have. There are simply

There are. There are however extremely few use cases for an immutable distributed ledger, which is sadly the other property blockchains have. There are simply too many cases when there are legal requirements to be able to delete data. DMCA, GDPR, Right-to-be-forgotten, anti-terror-laws, anti-libel laws, and so on.